> I have not seen that usage for less than 100%. So 600% conforms; 50% does not.

> For some evidence to support my claim

Please note that the 2008 discussion you linked does not support your claim in any way, so 50% does conform.

I guess we will have to agree to disagree.

I believe that the history of English language usage is replete with examples such as "X times less than" when X > 1, but similar constructions for X <= 1 do not appear with appreciable frequency.

In any case, I think that continuing our conversation is unlikely to be productive, so this will be my last reply.

I will just say in closing that our conversation is a good example of why the MAGA folks have probably chosen phrasing such as this.