I think they're suggesting that if you oppose decry congestion pricing because it's a not progressive, you should also oppose gasoline cost and gas taxes becaus

I think they're suggesting that if you oppose decry congestion pricing because it's a not progressive, you should also oppose gasoline cost and gas taxes because they're not progressive. Their thesis is that congestion pricing shouldn't be dismissed on grounds X, not that all these other things should be dismissed on grounds X. It's pointing out the inconsistency of supporting a bunch of inequitable policies while rejecting another simply because "it's inequitable".