All Cloanto has done is keep Amiga alive by selling legal ROMs and paying for improvements to those ROMs and other system files over time. Hence the 3.X OS designation...as in 3.10 because X=10 because it's an improvement over 3.9.
That's nonsense. I have not seen anywhere where they claim it is supposed to be version three point ten. You can even check their page at
https://www.amigaforever.com/kb/15-107 where no such claim is made. Also you can check the version numbers and dates of OS3.X components to see that they are just various random old versions thrown together.
Please tell me how their frankenstein mess of mismatched obsolete OS components is an improvement over 3.9. Anyone can take 3.9, remove half and overwrite half of what remains with with 3.5 versions, causing all kinds of compatibility issues for users and developers. That's more like vandalism than software development. And they certainly haven't improved any part of the OS themselves; what component are you claiming they have upgraded? They don't have source code for any AmigaOS version (including "their" AmigaOS 3.X) nor apparently any Amiga developers on their staff.