No idea. Is that even a tip?
I used to shave in the shower using my Mach 3, before I discovered traditional wet shaving. But I did that on my own as a time saving measure, rather than any specific tip of making my shaves better.
Since discovering traditional wet shaving, I’ve never heard shower shaving as a “tip” or technique.
Instead, the idea of shaving immediately after a shower is the tip I have learned and accepted. The shower proves to be an excellent pre-shave routine, and shaving is the first thing I do after drying off from my shower.