Perhaps you aren't aware of the ramnifications?
Nashville currently has a penalty of about $24M.
If Weber retires with 1 year left on his contract, they will have a cap penalty of up to $7.8M until 29/30.
However, if they hold his contract and he retires with 1 year remaining, that penalty will be reduced by roughly $4.8M next season, and up to $6.8M for each subsequent season, therefore avoiding the penalty entirely by 24/25 (check my math, posting this quickly ). Recalculate for each year remaining on his contract if he retires sooner.
Avoiding a cap penalty from 2026 to 2030 is absolutely a benefit for Nashville.

Nashville does not currently have a $24M penalty. Montreal currently has a $7.8M player on LTIR until 25-26. That doesn't affect the Preds in any way.

The worst possible outcome for the Preds would be Weber retiring in the summer of 2025, which would mean NSH would get hit with a $7.8M penalty for three seasons (25-26 through 27-28), and a $1M penalty in 28-29. That's the worst case scenario, and it's so unlikely for the various reasons I've already mentioned here, that no Preds fan should be losing any sleep over it.