There are TV mounts available that are essentially french cleats with a locking mechanism. I have one in my bedroom where there weren't studs where there should have been and we needed to use drywall only mounting (I think there was a relocated opening in the past that wasn't reframed or something).
I didn't recognize it as something of a french cleat until just now.
Something like this:
https://www.echogear.com/tv-mounts/no-stud-tv-wall-mount-low-profile-design-for-tvs-up-to-77-egld1/?srsltid=AfmBOopL6jDFGMf8UtY4qdg_HgZTnZCjg27WWo04W ASWzpmtBOF0QA3n
Yeah sounds like 70SATMan has something like this.
Edit: I wouldn't want to mount a TV to something that didn't have some sort of positive locking mechanism.