Could well be, though it has settings for "Rumble - General" and "Rumble - Stereo". Most of what I'm doing lately is 78s captured in stereo and I find that using both methods sequentially works great.
It also has a Hum setting and it's shocking to me how much it finds even though I can never hear it in any kind of normal listening. When you set it to just output the hum it's removing, you hear far more than you'd expect. Unlike the rumble, I can't hear a before and after difference with the hum.
Some records have more hum than others, which suggests to me that it's baked in. Now I need to see what it does with a very hum-filled Dora Hall track because the world needs more Dora Hall.