But u have USDT ERC20 what makes it better then TRC20?
The answer to this question can be found in the post you quopted. They already explained what makes ERC20 better than TRC20 for them.
Now, they have ethereum itself and also three tokens (USDT, DAI and USDC) on ethereum network.
They don't want to support a new chain just for a single token. As they said, there is no TRC20 version of DAI and USDC will be unavailable on Tron network soon. Also, it seems that they are not interested in Tron native token.
Most likely not and specially if the purpose of supporting the whole new network is only because of 1 stablecoin (USDT).