(AAMC Section Bank 'Gut Microbiota & GRCR' passage) Article analysis for MCAT

First of all, I am ONLY analyzing the parts of the article that are included in the AAMC Section Bank! I'm reading the Introduction (all of it) & Results section (but only the parts that relate to what's in the SB which isn't actually all that much)

I would like anyone and everyone's input on this scientific journal article as it relates to the MCAT experimental-based passages format / required skills. I've outlined what I noticed was relevant to the correlating AAMC Section Bank B/B...

(AAMC Section Bank 'Gut Microbiota & GRCR' passage) Article analysis for MCAT