Stocks like MSTR are for companies (like MicroStrategy) that live because of bitcoin! That means their whole existence depends on bitcoin so it is more than obvious that their stock should dump when bitcoin drops!
None of it has anything to do with your conclusion that "bitcoin is acting like tech stocks"!
We could make that assumption with MSTR, but BTC is only a small minority of Tesla's balance sheet.
Whether we like it or not, there's definitely some correlation between the more risk-on assets(BTC and high growth tech stocks). Take note that having market movement correlation doesn't mean that they're "pegged", obviously.