There are so many problems with that, I am not sure where to begin.
It is KickStarter. Way too many high profile failures lately. (I know I am an OG FLUX KS backer, but I have lost faith in KS at this point.)
It is a tiny vacuum cleaner with a HEPA filter. If you really want to do that, you can buy a small apartment size vacuum with a HEPA filter already, and the filters are cleanable/replaceable.
It’s going to be noisy, the quiet vacuum has not been invented yet. Not even by Dyson.
If it pulls enough vacuum to be an effective active filtration system, attaching that hose to a Delta printers effector is definitely going to mess with your calibration and screw up your prints. I don’t think too many Cartesians or CoreXYs would deal well with the extra weight or stiffness either.
There are much better, more efficient, simpler, inexpensive, and readily available solutions. Put your printer in an enclosure and add a filtration system. Build it out of MDF, acrylic, plexiglass, whatever suits you. Sandwich a HEPA filter between a couple 120mm server fans and mount near or on top and you are done. Quieter, more effective, and if you build it nicely, way more stylish, and you have actually made your printer better by giving it a controlled environment, which is more temperature stable and dust controlled.
The FLUX Deltas are not designed to print ABS (though I hear they can if done just right), and I would absolutely agree that you should have proper ventilation if you print with it. I stopped using it completely not only because of the outgassing while printing but finding out it continues to outgas for quite some time afterwards. I don’t know that PLA is any safer, but it sure does not smell as bad. I have not noticed any irritation and only had 1 spool that had an odd smell, almost like popcorn. That was one of my original FLUX spools. My machine is in an enclosure though, and it is next to a window, I never open it, but it is there if I need to. Cold weather is not a problem here, it is the opposite.
Before even considering this, just look on Thingiverse for Fume Extractor pick one you like, work it into your enclosure plan, and you’ll be much better off.