Question about revealing key and transaction "addresses" with Bitcoin

So recently there was recently a report that El Salvador broke up their BTC holdings into 13 BTC addresses to spread out their holdings for safety, some speculated that it was also to reduce quantum risk.

I was also told that once you sign a message or spend BTC from your address, it makes it easier to attack via a quantum vector.

So I have some UTXOs and BTC across a number of addresses on a hardware wallet. It also allows me to generate a "fresh address" to receive BTC, if I send all my BTC to myself in this fresh address, does that remove the risk I described above? Or do I have to get a new Trezor and send myself the BTC to a new wallet with a need seed phrase?

Thanks in advance.