The bike industry is no exception to the general market psychology that is causing this phenomenon. It's fairly straightforward - there was a shortage of everything due to covid shutting down factories and buggering shipping. So retailers ordered whatever they could order because demand was surging. Now that stuff is starting to be delivered, demand is dropping off because customers already bought all the stuff they could buy, but all those supply orders are still being delivered to retailers. Thus, oversupply. It's what happened to Target and Wal-mart and it's going to happen to every business that is supplied by international trade and manufacturing. And honestly, it's better than the alternative - having to sell stuff at a discount is much better than having no stuff to sell.
As for demand, I don't think many people put off buying a bike. If anything, tons of people bought bikes that they probably rode once or twice during covid and then never touched again. Those bikes are going to end up in the used market, increasing supply. It's already happening. I listed a bike this week that during covid would have been snapped up for a stupid asking price. Now, I am getting offers, but far fewer than during covid and for well below the asking price.