Is USDT TRC20 Reversible?
No — a confirmed transaction on TRON is permanent, and this is a deliberate property of how public blockchains work, not a limitation specific to USDT or TRC20.
Why irreversibility is the point
Public blockchains are designed so that no single party, including TRON itself, USDT's issuer Tether, or any exchange, can unilaterally reverse a confirmed transaction. This is what makes the ledger trustworthy without needing a central authority to arbitrate disputes.
What this means practically
Any "reversal" you might hear about — an exchange crediting back funds after a mistaken deposit, for example — is a separate, off-chain action taken by that platform out of policy or goodwill, not an actual undo of the original blockchain transaction, which still stands as it happened.
The practical takeaway
Because nothing can be undone on-chain, the only real protection is careful verification before sending: correct network, correct address, and a small test transfer first when sending a significant amount somewhere new.