Triton ONE in Jeju: is t-wallet dot io legit?

First-timer here, hello!
Am going to be in Korea next week and am considering playing in a couple of Triton ONE events in Jeju.

After registering for a Triton account, I received an email (claiming to be) from Triton that said all transactions at the series are cashless, with a link to t-wallet.io.

I have zero experience with e-wallets. Internet search for t-wallet.io reveals nothing, and Perplexity says to be highly suspicious and double-check fees and cash-out policies.

I am reluctant to use an e-wallet existing in an online vacuum.

I was told that some pros frequent 2+2 and am hoping someone might know if t-wallet.io is legit or not; perhaps someone with better internet investigation skills can uncover info I couldnt.

Thanks in advance!
Colby