3 months after landing it.
Now that's something which has never been done before. They didn't say how many engines were the ones which flew on the last mission, but there's always hope it is legit. Also intriguing is how they strap it down from the top, instead of holding it down from the bottom like liftoff.
We all know about the work hardening of metal as it's repeatedly contracted & expanded. It remanes to be seen if the 1st stage can survive all the stresses of a 2nd launch, the aerodynamic stresses of max Q, the vibration, the heating of reentry. Metal contracts & expands quite a bit as it goes from -340F to thousands of degrees.
The shuttle components were reused, but it took years. The mane engines had to be completely disassembled, boroscoped, checked for cracks, tested again. The boosters needed to be completely disassembled, packed with solid propellant & parachutes, transported across the country twice & stacked again. Auxillary power units, landing gear, & wiring usually was only good for 1 mission.
The only way they could launch every 3 months was by processing many components from past launches in parallel. The orbiter had to be rebuilt from scratch using components from many launches.