keep in mind that all the numbers reported there are specific to that special case with that mnemonic and derivation path. the process of going from a mnemonic to an address can be very different and consequently the speed can be very different too. for example an Electrum mnemonic could give you a lot more collision due to its different checksum method that creates a lot more collisions compared to BIP-39 so you'll have to check a lot more seeds than BIP-39. additionally different derivation paths, hardened keys, depth,... affect the speed by a lot. a hardened derivation path could be at least 50 times faster to brute force.