Hello :-) I have looked into this a little bit.

You can make this jump 100% of the time but you just need to be quick on the inputs and you need to aim the cursor towards the floor.

I used the same skill points as the any% run

Bullfrog jump strength (5 points)

Bullfrog charge-up time (5 points)

1. Hold down the left mouse button when you are inside the elevator.
2. Aim the cursor towards the floor. If you jump too high you will not reach the Professional before he shoots.
3. Press / tap the left movement key to exit the elevator and release the left mouse button immediately.
4. You should now be ready for punching.