That's right...

I used NFC Tools Pro on Android to change the information on the card. Mind you, that the memory is quite small so info you can put on there is limited.

I used a CoinCorner Bolt card then I also printed out a QR code with personal email, nostr pub-key, X-handle and other information on it.

So you could either use the NFC or just scan the QR kode.

I bought the card online before the Bitcoin Atlantic conference but never was able to put money on it because I couldn't set up an account.

Later you were given a card at the conference.