It wasn't only because of COVID-19, there were other sentiments involved too in the case of BTC reaching ATH. But it did make an impact tho. It wasn't a crisis like an economic crash. It was a lack of workplaces. People were unable to go out to work and make money. So they choose a way to do it from home. Maybe Bitcoin investment was one option but there were other options available too. People make use of those too. So I don't think it was the main reason behind the ATH.
Then again, if the crash happens, people will not be willing to let go of their jobs and move towards Bitcoin investment. The reason is, that it's risky. If it were in a situation like right now, where there are options available and no crisis, people would hesitate less when investing in Bitcoin. But in times of crisis, people will fear losing the remaining of what they have. I guess I am able to explain this clearly. So the thing is, people may move towards Bitcoin after the crisis and when they are able to live their life normally.