Bitcoin was not made to withstand a Pandemic , which is why it's price lost such tremendous amounts.
If you think being a bitcoin miner , insures good health, then you are confused, it won't.
Bitcoin is failing at being a currency which is why it's price dropped,
for the majority of people it is only a gamble to earn more fiat,
world emergency hits and people cash out the gamble to fiat,
because they feel safer with fiat.
Your so called antifragile btc is losing the miners profits
-~$4k per coin, so it is fragile if miner profit margins don't improve shortly.
People feel safer with fiat money,because they feel safer with something known.This is completely normal.
The BTC price didn't lose "tremendous amounts".There were price crashes in the past that were way harder than the last week price crash.If miners don't get any profits from BTC,they could just stop mining and leave.The hash rate/mining difficulty will drop,and mining will become profitable again.
If we ignore the volatile Bitcoin price,then yeah,the Bitcoin core blockchain is still strong and the fundamentals of Bitcoin Core aren't damaged by the crisis.