I'm pretty sure you're just making all that up, because almost none of what you said is true.
How can you be so sure?
If you actually own a miner that isn't able to connect to the pool due to difficulty settings, there should be plenty of methods to tweak that locally too.
There are exactly ZERO ways to tweak that locally, the share diff is set by the pool, not the miner, the majority of pools nowadays don't even let you choose the diff, but they are smart enough to adapt to the miner hashrate, all pools would start with some low diff and then climb their way up to the point where shares at kept at a reasonable pace between the miner and the pool, too high diff and you can't check your work on the pool, too low diff and your miner is going to submit dozen of shares every second which is plain foolish.
Amazing luck so far.
I underlined the keywords.
I have not tested the pool nor do I have the intention to take the gamble, but I don't think that person is lying, it's stupid to lie about something that could be easily verified by others, I mean I just happen not to give a shit about said pool, or else, it takes little to no time to actually confirm/deny his claims.