NAND flash memory chips have a limited time to retain data, for example, 10 years at a certain temperature and write cycles.

If I only power this chip once a year, is that enough to retain data permanently? With only 2 or 3 write cycles performed.

Example chip: Hynix HY27US08281A

It depends on what type of memory you are thinking about. SLC, MLC, TLC, QLC etc.
I meet SLC cases after 20-25 year, which generally no need ECC correction.
TLC,QLC need it immadietly after leaving the factory.

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Flash Killer - everyday new resources (pinout, XOR, ECC,config) for flash devices

Chips de memory flash used in memory card de ps2

PS2 = NOR; but you knew that already.

IS Nand flash similar model mentioned, i have Bitfunx memory card ps2