Octopart, etc haven't been able to accurately track inventory through this disruption.
Of note regarding the one you linked - great find; looks like that Octopart link was bad! I actually have some 491s, and they're great, except that the OSS firmware I'm using them with for this project doesn't support them. Got my own firmware working on them though.
I also have custom flight controller firmware in Rust that's running fine on G491, but Betaflight needs 47x or 48x.
No luck on getting H7s.
Edited to add: not that it matters now, we moved to a different MCU that we could get larger shipments of, and we’re lucky enough our application of them can be flexible enough to do so!