If it was a short period of time (a week?) this was going on, then sure. The emperor darting to the bathroom without his clothes on is unlikely to be a scandal after all.
But even if fed rates dropped tomorrow those bonds will not recover to par, because inflation on their principal amounts has already happened, and their interest rates are too low to ever recover back how much they have lost value barring truly exceptional deflation.
So unless they somehow come up with even more cash on hand to be able to avoid ever realizing those losses (good luck when everyone starts drawing down savings and boomers start retiring more and more), they’re boned inevitably.
Deflation wise, the fed will fight THAT even harder than the current inflation fight they are doing, and that’s relatively easy to combat - print more money. It’s why they’ve been printing money since ‘08.
Since the expectation is that inflation will continue for some time of course makes the math and present value even worse, but there is no plausible situation right now where the expected future dollar value of those bonds will be high enough to recoup a large percentage of their purchase value in today’s or a future dates currency.
That value is gone.