Hoaxland’s not a scientist, and his take is irrelevant, and is definitely not science.
Phobos isn’t “obviously metallic”, it appears shiny here and there at certain angles; from Mars-side it’s obviously rocky. The close-up studies of it lead to the conclusion that it isn’t primarily metal, at all.
Richard Hoagland and Tom Van Flandern had/have major kinds of astronophysics credentials; most of the people calling them kooks, including YOU, don’t.