fwiw, I lost almost 18 months from Memorial Day 2020 through the end of 2022 due to a spine injury and subsequent surgery and recovery. Going into all that I had a freezer compartment stuffed with roughly 20 pounds of pellets covering a couple dozen strains, all in their original mylar bags inside freezer bags.
My spine doc cleared me to "no restrictions" status this January and I've been brewing like a psychopath since
While I had no concerns about the ~350 pounds of base malt as well as maybe 40 pounds of specialty grains I had on hand, I had considered was how much "bang" all those hops might have lost during the down time, so on my first brew I arbitrarily increased the early additions by 50% - and found the result was noticeably more bitter than usual.
I decided if there was a loss of potency in sealed bags in a freezer over ~18 months it wasn't worth countering. I've brewed 60 gallons across 6 batches using unadjusted recipes and they have all turned out too close to "original" to notice any change.
Curious about that I looked around the web and found this
"Hop Freshness Calculator" that at arm's length seemed to consider all the right metrics. According to the calculator if one puts sealed bags in a 0°F environment for 18 months the losses would be under 10% - solidly in the "can't tell the difference" realm. I can live with that
Cheers!