as a data point, keto helped me put on a ton of muscle. I do lift weights 6 days per week, but I attribute it to increased testosterone. I've been fairly principled in my approach to experimenting with keto, including doing regular bloodwork.

Prior to keto my T was around 450. Post keto (~2 months in), it was close to 800. I was/am eating a ton of fat. I don't measure it (I eat intuitively based on hunger) but I would estimate my fat intake to be around 200g fat/day or more.

Just my personal anecdote. We'll see how long I live for ¯\_(ツ)_/¯