They might be a consolidate line, though. They also have an A after the part number, for example, M1-102A. So I'm not sure whether these are special filters just for Walmart, or are they all going to have the A eventually now that they're good for 20k instead of 15k.
There's no M1-209A, but there is both an M1-108A and M1-110A. The only cartridge M1 at Walmart is the M1C-251A (the Toyota GR V6), which is priced at $15.97.
The new M1 is still not a wire-backed synthetic. They still seem to be the same Champ construction they've always been, and had recent date codes (November 2016 to January 2017). So the bankruptcy has not affected M1 filters AFAIK. And they had the slotted center tube. All louvers, no round holes.