When you download a version to install it tells you if it's LTS or Interim and in fact on the download page it even tells you when it's supported through. Suggesting someone gave you an impression or anything else was most likely a misunderstanding on your part. You can go right now to the download page and see that 22.10 is an Interim release and has support through July 2023, 23.04 is an Interim release and has support through Jan 2024 and the only release that has long term support (LTS) is 22.04, and it's supported through Apr 2025.
No Ubuntu MATE release has ever had 5 years of support as long as I've been using it (4 years now). But I don't even question it because it tells you on the very link that you click to download it.
Now, a bit of advice from a person who's used LTS and Interim releases. I don't really know what the differences are even though it says what they are if you read about Ubuntu MATE LTS releases. I have the flexibility to delete the programs I want and install the programs I want and that's the main thing I'm concerned about, so frankly LTS is probably best for most people so you have a long time before having to update your OS. I've heard people say you're frozen into certain software, but I haven't had issues deleting or installing anything and updating software as needed. Maybe for a small package of software you get frozen into a certain version and can only install updates to that version but I'm guessing for most people who are used to using Windows it's not an issue at all. I'm used to installing an Office set of applications for instance and using it for many years because I'd rather use the same thing because I get used to its behavior and I learn how to do what I want quickly. I don't want to keep relearning a software package every couple of years.
That's my two cents. I installed 22.04 and am glad I did though I do have issues for which I don't know if it's the Ubuntu core or MATE, I think it's the core, but I have a dual boot system and drives that are EXT4 and drives that are NTFS where I can use data in either OS so it's not the most friendly system for Ubuntu to deal with. Most my issues arise from using a file explorer of all things, but I also have Caja AND Thunar installed so maybe I shouldn't be surprised. I had the same issues with an older system and older MATE, basically a similar config though, dual boot, dual file explorers in MATE and a mix of NTFS and EXT4 drives.