What math? Their factory is underutilized, anything not utilized 100% means loss for them. You don't earn on unmade silicon, you pay salaries to people and logistics that do nothing.
The problem is they got caught also in the bitcoin bubble demise and as usual for Asian companies, they a damn slow to adapt to it, bureaucrats, they sometimes even top Soviet habits, but hey... PCR is near lol. They didn't realize it is over, NVidia strongly signaled with making silicon at Samsung that the games are over and TSMC cannot play the monopoly card also, as they wanted larger piece of the pie. Soon many fabs will become operational and let us see how the greed will pay off.
The objective historical statistics should be normalized without silicon made for crypto. Then the real consumer device market demand number should align as it should, with increase actually, yes. Covid did spark some numbers up, but not that drastically as you wish... I suspect those numbers got mixed with crypto and some(nvidia) did that on purpose. There were need for basic laptops and PCs for school/work etc but why the heck why that would need overpriced RTX cards to have online lectures or work meetings? For RTX crap voice as some leather jacket tried to upsell as next best thing since sliced bread? The amount of farming was huge everywhere, people only grasp a small part of it from media and think that it doesn't happen around them, but it did. TSMC suffers from it, they are slow to adapt. That was known already more than half year ago and still they act like princesses.