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It's still supported on 18.04 LTS etc, they just don't want to support it in 20.04 LTS, so this is a preparation move.

I mean why not support it only on 20.04, 22.04 and so on.

Because that code will then be untested for the releases between LTS and hence more fragile and expensive to support within it.

The code will be tested in its 64-bit form. Is 6 months not enough to check for 32-bit specific bugs? How often are there 32-bit bugs anyway?