That is really interesting, but not practical sizes. I have used 0.2mm ID tubes as a physical low pass for a the bass driver on a diy iem, and it is not reasonable to try anything smaller, especially for full range.
A nozzle diameter change from something like 3.5mm to 3mm for example, should not affect bass at all, should shift 2k-10k peaks left a bit and reduce volume a bit.
Edit: summary, the point I'm trying to make is that at 0.2mm and less, you're just showing when you can almost completely choke off the sound. For bigger tubes or nozzles (1mm+) the difference is subtle but still real in how it affects the peak frequencies and volume.