I’ve been following you on the CP & Carmel threads. Welcome & God bless you in your journey.
I just skimmed through the material on the site mentioned. I am not enough of a apologist/theologian to advise you on it’s contents, but this is the manner in which I approach non-Catholic material. There is so much Catholic material. Why would I put myself in the position of possibly being getting information which is even slightly off?
St Ignatius speaks of discernment in the Spiritual Excercises # 313-336
Here’s another great article.
Search on discernment and read the Catholic material