I do not know for the Helix Tubolito but I bought two ETRTO406 Tubolito's for my Moulton.

These two were one after the other replaced for free by Tubolito due to leaks around the valve.

One of the replacement had a puncture that I could locate and I applied a special patch from Tubolito (Tubolito cannot be patched with classic butyl inner tube patches and glue). The patch didn't last very long, after one month or so, I had small leaks around the patch. I replaced it with a second new patch and the same problem occurred after a short time of use. My conclusion from this is the the very expensive Tubolito's cannot be repaired after a puncture.

The fourth, last Tubolito had a slow leak and I couldn't locate the place of the leakage (the Tubolito's cannot be inflated at high pressure without being mounted into a tire, the low pressure at which it is possible to inflate a Tubolito alone didn't allow me to locate the place of the leakage).

This was the end of my Tubolito experience, at about 30€ piece, I didn't wanted to invest more

For the Donnelly tires, because they are mounted with inner tube and not tubeless, I am afraid that at these very low pressure and because the tire is quite narrow, there will easily be puncture by pinching of the inner tube between the tire and the rim wall.