First off, please don’t post links to paywalled sites - very rude.
Second, this does not require anyone to purchase a safety device. Gun sellers only have to sell them now. No additional purchases required.
And yes, I agree it is another foot on the slippery slope to denying your 2A rights.
Are you suggesting that the FFLs don't have to pay to get the locks they're being forced to sell? That wholesalers are going to GIVE them the locks FREE?
If the government can force FFLs to stock gun locks then they also can force Piggly-Wiggly to stock Beluga caviar, fentanyl gummie bears and weapons-grade Pu-239.