as long as tether stays around and keeps being printed btc will always been manipulated, their offline wallet and richlist can still be seen. You can clearly see there how it is being printed
I suspect within a few weeks the whole tether scam will collapse and the news will be all over it.
It will trigger a bitcoin sell-off like we've never seen before when people realize that 90% of the market cap of bitcoin is fake printed tether money.