I don't think the above is correct.
I have 2 supermicros and are both fitted in non-supermicro cases.
But since none is a X10SLL-F-O I can't be 100% sure - sorry..
uATX is uATX. If the standoff holes were in nonstandard locations, it wouldn't be uATX. You need to take newegg reviews with a grain of salt. I once saw someone give a sas drive a single star because it had 'some weird proprietary connector instead of a sata connector'.