Basically from what I understand, you are given the hashed seed and not the actual server seed. So its true that you can't actually verify if its provably fair however even if you were given the unhashed seed, how do you know if its indeed the correct seed since you never actually verified this seed before you started betting.

So in both cases you are correct it won't help you out in that way. I am assuming the main purpose of this bet archive is maybe for a gambler to put their results in some excel spreadsheet and found out in which ways they can improve their gambling strategy.

Its kind of like a trader who analyses all his trades for the year and can find out in what ways they can improve their strategy for more profit.