That feels a bit mis-representatative: There's no conclusive evidence, but there is weak evidence in favor.

The first doctor says it doesn't matter, the second says it does, and the three linked studies say (mildly harmful, no effect, no effect), with small sample sizes. The first doctor also explicitly states that he'd still wipe front-to-back if he were female!

I'd call that weak evidence towards harm, i.e. this is potentially harmful advice.