Are floppy disks safe to store wallets?
No.
There are way better alternatives nowadays. I'd consider CD, DVD, M-Disc, Cloud storage. Just make sure your wallet is encrypted with a strong password and with quantum proof encryption.
And always name your wallet files randomly, naming as "My Millionaire Bitcoin Wallet" is definitely not a good idea and will just encourage brute force attacks and attempts. Naming it as "travel_71nYNujPnL" would work otherwise.
Even binary data printed in sheets of paper and buried somewhere in this planet would be safer than a floppy.