Changing the meaning of words (i.e, reducing stigma) never works. It's a practice used by authoritarians to get what they want fast because it's cheap and relatively easy.

I'm curious what the GP was told that makes them think the alternative to endorsing single motherhood is worse. The alternative to reducing stigma would be fixing the underlying issues that cause the stigma...in this case the lack of ability for a single parent to provide. We have plenty of resources to fix this, but they're disproportionately distributed in favor of those at the top. Funny enough, both the left and right at the top have solutions different than what I described. The left wants to destigmatize, and the right wants to shame (another cheap and relatively easy tactic used by authoritarians).