It’s marked solved, but since OP didn’t post the solution:

-e uses basic regular expressions, where you need to escape the meta-characters ((|)) with a backslash. Alternatively, use extended regex with -E

$ echo a | grep -E "(a|b)"
a
$ echo a | grep -e "\(a\|b\)"
a
$ echo a | grep -e "(a|b)"
$ echo a | grep -E "\(a\|b\)"

Try it. The worst that happens is that it makes things slower and then you turn it back off.

The x390/x280 are the same era as these but smaller, so might be a better fit here. The X390 has soldered RAM though, so I’d look for the 16GB version if you can find it (there’s not much of a price difference used)