There's no canon source to confirm it, but Palpatine's mumbling about creating life definitely lends support to it, and considering the obvious implication by extrapolating in a straight line is not a reach (inb4 someone says that's the literal meaning of line extrapolationSaying Palps created Anakin has always been a reach at best. There is nothing in the films to back it up. Literally nothing.

I believe mother Aniseya's actual actions will remain a mystery at the end of the series, and like Anakin's origin and Palpatine's comment, open to interpretation (even if less so). But nothing wrong with someone preferring the most literal and straight interpretation that had been obvious to the writers in both cases. No need to disregard that by saying there's none support for it in canon whatsoever.
On the other hand, given the difficulties with project Necromancer, and the importance it had to the emperor, one can argue against technological means for the creation of Mae and Osha, and conversely against Palpatine finding it so easy to just create Anakin directly. Of course, arguing both would imply this witches excelled over Palpatine in something (which would be too fascinating to just brush over with a throwaway line). And project Necromancer is not necessarily comparable for it was intended to resurrect a particular person, retain his complete Force sensitivity, then recover his memories, when no Force users were available to assist the process.
Also, not only it's additional context that didn't exist at the time of ROTS, but it's additional context created specifically to excuse the silliness of TROS. I feel like The Acolyte fits more naturally in, and follows from what's been established about the Force and the Star Wars universe so far.
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