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That's very interesting. Especially as I'm constantly picking up records that sit less than flat on the table.
So, you need the "flattener" + the heating pouch, right?
EagleEyez-
You can use the flattener bare in the oven. The pouch is probably easier than the oven. I bought them as a pair second hand. It takes some time to work out timing. Depending on each pouch and the heat it reaches, plus the size and weight of the record. With my pouch I get decent results around the 5 or 6 hour mark. You can overcook a record, especially in the oven.
I've been slowly flattening an expensive disk that was pringled from sun exposure. It's had months of cold pressing, some heated pressing increasing the time slowly and it's getting there now. With smaller warps on new records I give it a few hours. There's a fair bit of trial and error but it can/will do the job.
Airhead
The warping happens when they open the press too soon and the record cools down without pressure from the press. I have a vinyl flat with a heated pouch which I've used successfully to remove warps. It seems less effective on warps caused after pressing, like leaving a record in the sunshine on a record deck. Only anecdata but so far it's made a considerable improvement to anything warped that's gone in it.
https://www.vinylflat.com/