OK, Toi, I took the bait and found the website.
Somewhat of an interesting read, and they were certainly more respectful than the Chabad critics from the religious left or non-religious sects. However, their knowledge of specific Chabad texts implies that there are some ex-Lubavitchers involved with the site, and their knowledge of the Orthodox world in general seems more lacking. I suspect it’s a site made by disenchanted Lubavitchers who are now probably MO, and it is not a site that represents mainstream Litvish opinion.
In their “halachah” section, they just quote sources speaking on general concepts (specifically praying with an intermediary) and apply it to Chabad themselves. They quote no contemporary sources who say these things actually are a problem with Chabad.
They seem to have a problem with very mundane, Chareidi practices like having pictures of Rebbeim up, learning from their Rebbe’s works during Shabbos meal, etc. This leads me to believe the authors have no experience with the frum world outside of Chabad and a few things they learned by googling a catchy phrase like “halacha of praying to intermediary.”