Harder by orders of magnitude: https://jacquesmattheij.com/sorting-two-metric-tons-of-lego/
I've seen way too many "How It's Made" episodes... He needs some sort of vibrating table, and a high speed belt with a "jump" of some sort to combine with those air cannons.
And film every single test run and failure. I would subscribe to this Patreon!!!
Some problems that you will run in to:
- the timing will need to be very precise
- you will likely need sensors before the stations
- Lego bricks come in all shapes and sizes and will respond unpredictably to air currents
- you will need a way to arrest momentum or they'll shoot right back out
Still, this is orders of magnitude faster than my contraption if you can get it work.