Stine is an adult convert, former agnostic, and admittedly not a theologian. On his social media account masthead, he says "Not a Sedevacantist but I don't hate them either." His YT style does come across as somewhat egghead, but he's definitely been moving to the right lately in who he sides with and who he criticizes.
Kennedy Hall is SSPX though I couldn't say for sure whether neo or -MC. He's one of the people openly feuding with Salza. To the extent that he never misses a chance to bash Trudeau, if he can win over some NuChurch Canucks, power to him.
I'm not defending either of them necessarily, but neither one comes close to TM's nonstop self-promotion as some sort of envoy and spokesman for all of Trad-land.
Yes, I have heard many good things from him and Marshall and Kennedy Hall and the others.
Yet there are some big red flags.
One is that I can do a Google Image search and find photos like:


And articles like:
Benedict XVI sets new papal record for mosque visits
https://www.ncronline.org/news/vatican/benedict-xvi-sets-new-papal-record-mosque-visits
Yet for years all of these tradcasters have spun a tale that Benedict was so Traditional when he got older. Again and again and again I heard them say that sure Benedict was liberal in his youth but as he aged he became a staunch conservative and Trad and that is why Francis hates him so much because Benedict is sooooo rigid and traditional and that's why they luvvvvv Benedict.
Now why is it that I can find information that clearly shows that is not true but none of these guys can find it?
Why do they all push that narrative?
Are they really terrible researchers or is there an agenda?
Most of their watchers are led to believe these guys have done the hard research and we can trust what they say. That narrative kept many Catholics in the Bennyvacantist camp because they were misled to believe a complete lie.
The truth is that there was no difference between the theology of Benedict and Francis. In fact Benedict was worse in many ways.
Plus they all push ABVigano and don't seem to have any problem whatsoever with ʝʊdɛօ-Christian worship. Taylor Marshall and ABVigano actively led naive Catholics into mortal sin by promoting those events and encouraging Catholics to attend.
They never notice any of the many, many heresies in ABVigano's speeches. Novus Ordo Watch has enumerated them in detail.
They push the lie that Pope Paul VI declared VII is not binding when the opposite is true.
Pushing Malachi Martin who is a very sinister character indeed and Garabandal and more questionable prophecies is also a huge problem.
Uneducated and naive Catholics who are new to Tradition are being lied to and misled in very serious ways. More people need to expose these guys and their errors.