Ok, just finished my every other year, pre-winter scrub and refinish on this deck and thought to share pics of how the reworked planks, plugs and butt joints fared after two years of Utah sun and snow.
The planks look pretty good, not as nice as they did 70 hours out of the planer, but still substantially better than the surrounding decades old wood.
Butt joints and glued in plugs have not degraded and overall pleased with results.
(but not enough to feel urge to take on doing the remaining, much larger sections of the deck where the framing is degraded but still intact - working at ground level is
hard and it's easy to find other things I'd rather do....)

Scrubbed and treated with brightener.

Sanded and applied a coat of Penofin red can

Close up of butt joint and hole plugs, kinda surprised no real degradation.