The article you reference says the Saturn V was 2.5x more lift than the this new toy from SpaceX.
Which puts the SLS from ULA and NASA at at least 3.0x of the “Falcon Heavy”.
SLS will put 143 tons into L2 orbit, something SpaceX will N E V E R achieve.
The Falcon XX seems to be comparable to the SLS.
Falcon XX
Falcon XX is a single core launch vehicle with a diameter of 10 meters and an estimated length of about 100 meters using six Merlin 2 engines operating at the 100% thrust setting on its first stage creating a liftoff thrust of 45,360 Kilonewtons (4,625 metric tons).
Again, the upper stage of the vehicle was not specified at the time, but a one or two-engine Raptor design would have been one likely way to go. Falcon XX would have engine-out capability for a portion of its ascent. Low Earth orbit payload capability has been estimated at 140 metric tons.
A heavy-version of the Falcon XX with three cores has not been presented by SpaceX, but would be an option to boost the vehicle’s payload capability to more than 400mt.