Sorry, but that’s just bad info. A 5k genset really wants to be fed to a 30A-2P breaker, which isn’t just “any old outlet”.
220?
Most are.20a. You can split to 2 if your loads are fairly balanced to each side of your circuits
That's what I thought, my neighbor had a special connector in his garage that was designated for his gas generator..........
He only needed it once before he died but at least he let me plug in my 100 ft. extension cord to power my sump pump when we had a few hour power outage......Just long enough to drain the sump till the power came back on