Newbie, made rookie mistake. stuck transaction at 520 confirmations

Gate.io is not a wallet app; it is a cryptocurrency exchange. It’s not your BTG wallet, it’s Gate.io’s. But they are expected to credit your exchange account when you make deposited there.

There is no such thing as being “stuck” at this many confirmations.

If you look at those addresses or those Transction IDs in an explorer, you’ll see that blocks keep going by, and the confirmation are growing.

A couple of explorers to try:

https://explorer.bitcoingold.org/
https://btg1.trezor.io/
https://bitinfocharts.com/bitcoin%20gold/explorer/
https://btg.tokenview.com/

The BTG blockchain has never been “stuck.”

What you’re seeing is a Gate.io page which is “stuck.” The problem is on their accounting/reporting side; you need to work with them to resolve this.