They believe that through this, they are reducing the risks of losing all their bitcoin should quantum threats be real in the future and their holdings get attacked. That is the only reason why El Salvador is moving their bitcoins and I believe this should be something we can all learn from El Salvador. Distributing your bitcoins in more than one wallets will save you in the future and El Salvador knows this.
You confused me here with a decimal in the number. It is not 6.274 it is 6,274. Please correct it, really, I almost wrote a some lines before checking the link that they really are that insecure that they moved their 6.274 BTC to 14 different wallets haha, I mean op you must take care of such typing mistakes.
Or that's how you wrote, never mind. The amount is too big and now I think it is the best way to deal with this but how will those wallets be safe like from QC, although I have heard some news that the risk is now greater than before? If this is really concerning and a country is moving, then we might see some QC resistance wallets in the future and I want them to start their journey from BTT hehe.