That's exactly what prosody is doing, but it's a weird solution. Essentially, they're just ignoring the missing EKU flag and pretend it would be there, violating the spec.
It seems weird to first remove the flag and then tell everyone to update their servers to ignore the removal. Then why remove it in the first place?
I think you're confusing different actors here. The change was made by the CA/B Forum, the recommendation is just how it is if you want to use a certificate not for the purposes intended.