Look into mist/air blast, it’s the most practical/effective option we have unless you want to build on a waterproof base/have enclosure/electronics protection/etc…
I started with just a dust shoe on aluminum, works OK but you have to be really careful slotting/pocketing deep materials. I had to rake stuff out constantly when thru-pocketing 3/8". Air blast handles it easily.
Real flood coolant (enough to clear chips in slots/pockets) is just not worth it on a MPCNC IMO. What you have in that video is just little mounds of chips sitting in your cut, I’m sure a lot is getting re-cut. Mist will get you some cooling/lubrication and much much better chip evacuation.
What kind of tool are you using? Looks coated.