There was a reason it was 2 months behind, it wasn’t just one device not getting it. But this is very relativ, so lets focus on other things.
As stated here from Manoj before, the list is for Community not regarding Official
Read also when the whole a15 stuff started months ago:
For Official there are OS OTA Upgrades, for which you can also get information here in the weekly. As far as I know only Fairphone 4 has official with a15 from the devices which had a14 or something older
Edit: Fairphone 5 not 4 has official a14 and not a15