I may be able to answer your question, being the author of the guided meditations on the site you referred to.
In short, the meditations that relate to the figures, Mary, Francis, and Michael, were derived from my personal inner experiences with those figures, rather than from Catholic doctrine. I suspect that may be the only answer some will need. For those interested in knowing more, please feel free to read on.
Prior to writing those, I had authored a series of more general guided meditations that were intended to help the listener relax deeply and connect within. These have been in very wide use since the mid 1980's, in particular, one called The Healing Waterfall.
In the process of doing my own meditation practice (unconnected with the Church), I began to feel an affinity for Jesus, Mary, Francis, Michael, and a few other figures. As I opened my heart and listened within further, I came to feel more and more of a bond with them, and derived much solace and comfort from my experience.
As I already possessed the skill of helping people relax, go within, and find peace through the guided meditation process, I felt moved to help other people find their own relationship to these great spiritual figures who had been helping me. The making of the Mary, Francis, and Michael meditations came from that impulse.
Not having been raised or educated as a Catholic, once I completed these meditations I was curious to know whether the wording and philosophy they contained might be compatible with Catholic doctrine. (I was sensitive to the fact that the figures I was writing about are so important to Catholics, and did not want to bring offense.) So I asked several friends who were devout Catholics to listen and offer feedback. Their feedback was positive in regard to the experience of the meditations, and they felt there wasn't anything particularly at issue with the content. That's not to say that under another's scrutiny, or analysis by a religious scholar one wouldn't find points to argue. Again, doctrine is not my area or specialty.
The intention of the meditations is to provide an opportunity for the listener to have their own inner experience of these wonderful figures, and because they are somewhat open-ended by design, they seem to work for that purpose.
It may be of interest to you that they have been purchased and used by some Catechism teachers for their classes, because they were looking for a way to help their students to develop a personal connection with the material. From the little I've learned, I've also become aware that there seems to be a broad range of what is considered "Catholic" among Catholics.
I hope this helps answer your question, although it may raise some others. If I can help further, please let me know. Thank you for your interest, and God bless.