The background to my answer: I am a former Episcopalian who went through RCIA, was on an RCIA core team, am a trained catechist and now work at the diocesan level.
I have no doubt that at some parishes there are very poorly trained catechists some of whom push progressive agendas. In my very conservative diocese there are 5 churches (out of 110) where I can definitely say this is true.
That being said, there is a tendency in western culture, particularly American culture, to want things our way when we want them. People approach the church the same way. I witnessed this a lot working for the Episcopal church. People would come to the Episcopal church because they were tired of the hoops at the Catholic church and wanted baptism/communion/etc their way. They didn’t want to attend classes, change their lifestyles, be a part of a community, or wait 9-12 months to join the church. They wanted one to one service on their schedule with no expectations on them to get out of their comfort zone.
It has never seemed unreasonable to me to expect people to learn about a faith before committing their life to it.I was exceptionally well versed Episcopalian and was already catechized as a Catholic way more than the average Catholic before I started RCIA. I still benefited from it and saw how much others can benefit. I learned how to “be” Catholic. I learned Catholic culture. I got to practice patience and understanding. I actually met people.
Prior to the 1960s and 70s, you could pretty much expect that your typical convert had a basic understanding of Christian civilization and familiarity with the Bible. You cannot assume that anymore! Even the so called “well-catechized” Anglican or Lutheran (or Catholic!) is likely to be holding on to a number of new age, pagan or quasi christian beliefs. We had a good Methodist lady who was going through RCIA. She believed firmly that angels were dead people. She was so traumatized when she learned that Catholics don’t believe that, she quit coming! She had met with the priest several time, she had been through 7 months of catechesis including marriage prep, had been going to mass for a year but abandoned it all over that one conviction. We had other good, good former protestants who had memorized huge amounts of scripture and were holding on to sola scriptura to the end. Some people wanted to hold onto their pro-homosexual or pro-choice beliefs.
Also, it is amazing how many peoples stories and facades fell apart over the course of 9 months of talking to people every week. We have had several couples in RCIA who managed to make it 4 months acting like they weren’t shacked up, but by Christmas it had come out. Others were going through it to please a relative, but didn’t believe anything. Others had significant mental health issues. A lot of those people were eventually received, others weren’t. All of them made it past an exceptionally holy priest by lying or hiding things, and probably would have been confirmed by him immediately if not for the built in waiting period. Honestly, the biggest thing working for the church has taught me is to love everyone but not to take peoples stories at face value. There is often a hidden story lurking right underneath! I am jaded enough at this point to see the article authors mention of going to multiple parishes seeking confirmation as a red flag to a bigger and deeper problem than just at the parish.
The biggest problem I see is not RCIA per se but the fact the window for joining RCIA is usually August-October and most parishes have absolutely nothing to reach and minister to those people who show up in the winter or spring.
All this being said, all of the priests I know have made exceptions. They tend not to make exceptions though if you say “I want”.