I read some of his essays and a couple of his books when he had his website up years ago. I've heard, but haven't confirmed, that his family is attached to the Novus Ordo and didn't approve of some of his views, and so took down his website shortly after his death. His website can still be found in its last state a couple places on the web (
http://www.the-pope.com/coomcawr.html). He was the personal physician of Mother Theresa for some some, but later had a falling out with her and published their correspondence on his website.
In the last couple years of his life I struck up an email exchange with him, mainly consisting of me throwing compliments his way and and him thanking me. I was entertaining the possibility that the Novus Ordo and "conservative" EWTN-style Catholicism is fraudulent around this time. It wasn't a very interesting exchange because I was out of my depth. I was not yet, and still am not, all that sure that what I was positively responding to in his writings had to do with Catholicism or perennialism. I think what particularly excited me about his writings were the broad statements and arguments against modernity; these same qualities I found in some perennialists like Guenon, less so in others.
He kept in close contact with perennialists all his life, his father Ananda being a leading figure in this group. And his revised edition of
The Destruction of the Christian Tradition was published shortly before his death by the publisher World Wisdom, which specializes in perennialism. I asked him why he chose this publisher and he replied that no Catholic publisher would accept the book.
He was close to Fr. Malachi Martin, who has always made me uneasy. Also his relationship with perennialists makes me uneasy as well because of their heretical proposition that all the major religions share the same god. And many leading lights of perennialism disagree on which religions get to be included in the "Great Religions" pantheon.