I'm thinking he meant using the compression tester, not doing a compression test.
You would have to keep the relief valve depressed for it to work though, so that it doesn't hold the peak pressure.
This may be a quick indicator, but I guess the right thing is to get the leak down test kit.
And CD4Accord you shoulda buy it for that $40. Must be facepalming yourself now eh.

EDIT: BTW good read