Its too early to conclude that the prices of altcoins are recovering. Its gonna take a while for the altcoin market to recover. StableCoins are making it impossible for altcoins to increase in market value alongside bitcoin.
Stablecoins are not making the price of Bitcoin any higher. I stay away from them.
If there is a failure in the price of USDT, then this can provoke a change in the price of BTC.