Yes. I went for gold league in the 2023 soccer event. Doing so involved clearing a significant number of full boards as part of my diamond expenditures, and I could've done many more, but it wasn't efficient compared to using my resets.
But if your primary interest is not in grand prizes/league progress, but rather in clear board prizes then yes 25+ boards should be no problem (bear in mind this is instead of 66+ non-full-clear boards by taking efficient resets, which is why this isn't the normal recommendation for playing the event).
On the other hand his conclusion that since he's mostly gotten prizes in the 40% for ww or shrink kit his good/bad luck in beta will apply to every world in terms of what you win from those 25 boards, that's just poppycock