Does being launched by an enemy soldier's rocket crit-boost your market gardener?

The market gardener deals critical hits during a rocket jump. Now the question is:

 What if the rocket doesn't belong to the jumper?

So essentially what would happen is, an enemy soldier shoots at your feet, and you get launched a few feet in the air by his rocket. Now is this considered a rocket jump? In other words, will a successful hit with the market gardener result in a crit at this point?

Yes, the weapon would still crit.

Market Gardener considers you to be rocket jumping if you are airborne because of any explosion- including explosions from enemy explosive attacks. It still won't count other attacks which could knock you into the air, such as a Pyro's airblast.

The weapon demonstration for the Market Gardener shows a soldier launched into the air by an enemy Demoman's stickies causing a crit.