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From what I could see from the parts diagram (SIDE MOULDING. 2022 Lexus RC 350 F Sport | Lexus Parts & Accessories Online) there are actually 2 nuts holding that piece in. You will have to remove the interior "triangle" trim that just pries off since it's held by clips, and then youll have to remove those two nuts. After that I speculate it'll likely come right off, UNLESS if there is 3M adhesive around the edge (confirm with the new piece). If there is, you will need to heat that area up with a heatgun or blow dryer and then use something like fishing line or really strong dental floss to get rid of the adhesive. I don't believe there is an 3M tape as there is no tape residue in your picture, so it should just be the two bolts.