"We sincerely apologize for any inconvenience and appreciate your understanding continued patronage in the future."

I think your answer is right there in the Makah's "we're closed" notice. Hikers, sightseers, surfers and sport fishermen are a big part of the Makah's cash revenue - especially since they have not gone down the casino road - which I appreciate.

Have been going to Neah Bay annually for the past 50 yrs - as a kid when the "docks" were nothing more than a couple big logs cabled together with plywood tacked on top - to taking my own kids - to now them going there with their own boats. Love that place and the surrounding forests, beaches and water and would certainly hate to loose access but I really don't think the Makah's have any nefarious intent in isolating right now other than protecting themselves from Covid.
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. . . and God said unto them, Be fruitful, and multiply, and have dominion over the fish of the sea . . .