I assume you've also read the other thread too, ie. No LTS Release for Ubuntu MATE 26.04
The wording I used (to describe where we are based on current official Ubuntu Technical Board posts) in the Ubuntu Weekly Newsletter is
LTS qualifications for Resolute Raccoon
Robie Basak reports the Ubuntu Technical Board have agreed that Ubuntu Budgie, Ubuntu Kylin, Xubuntu, Lubuntu, Edubuntu, Ubuntu Studio, and Ubuntu Cinnamon have been approved for LTS status for the Ubuntu 26.04 release. The remaining flavors are still subject to approval on request and will be non-LTS.
ie. CURRENTLY we know what official flavors have applied for, and been granted LONG TERM SUPPORT status for the Ubuntu 26.04 LTS release.
According to the last know 'official' update from the Ubuntu Technical Board (that I'm aware of anyway), Ubuntu MATE hadn't applied (and isn't the only flavor in this state) and thus may still be given permission for a 26.04 release. If a 26.04 release is approved we're to expect a standard 9 month release is all we currently know.
At least one flavor has had an official ISO release (these can be downloaded at https://cdimage.ubuntu.com/ and are built on Ubuntu infrastructure), plus also had respins they've hosted themselves; so there is ~little preventing any team from producing their own respin ISO, but official ISOs have a strict & documented procedures which the Ubuntu MATE team hasn't completed [yet].
Ubuntu MATE has been struggling with lack of contributors for awhile now, though they're not the only Ubuntu flavor team in that situation, but the lack of LTS application is likely a side effect of that lack of resources.
The Ubuntu MATE team were late with a Ubuntu 25.10 milestone, but did get late/belated approval there, which was a necessary requirement to be involved in the 25.10 & 26.04 release, so we know of some intent expressed a few months ago, but everyone has draws on their [limited] time.
Currently we don't know what exactly will happen... We'll have to wait and see, though anyone who'd like to step in and contribute may help get Ubuntu MATE closer to official release would be welcome.