Olympus/OM TG-series question

Hi all, deeply amateur photographer here and have only done underwater photography once while snorkeling. This is not specific to scubaing, but I am planning a trip to Hawaii and hope to snag some underwater sea turtle pics. I was recently recommended the Olympus/OM TG-series , rather than a housing for my canon R7 (manly for budgeting/convenience reasons).

I was wondering if anyone has experience with the TG series and if image quality feels decent enough. I am also wondering, as I know flash/strobe is critical for macro shooting, if for larger subjects like sea turtles a strobe or something similar is also important?