This is one place Nuvyyo did a good job confusing people. The old 4 tuner is not a Tablo Quad. It’s just a Tablo 4 tuner. Only the new 4 tuner is marketed under the name Quad.
I have the old 4 tuner just like you and I assure you commercial skip does work. Keep in mind however it’s a beta. You should familiarize yourself with the details to get the most out of this feature. The guide is in the post above and it should help.