Hole in the tube looks perfectly fine for a homebrew refocus ring to expand your depth of field without cutting light levels too much. If you're wanting to operate the unit in the daylight, that's where you'd want the pinhole instead. If you're going to be hanging your NVGs from the wall or something and they'll be getting light on them all day every day, I'd just tape up the holes with electrical tape so they were solid without the potential for light to enter the unpowered tubes.
A user on a NVG discord server this week did some experimentation to see if leaving unpowered tubes out in the sun would damage them - they didn't witness any visible damage, but I think the jury's still out on what actually happens to tubes when they're sitting in sunlight turned off. I'd still avoid it and 'run protection' when possible, especially if they're just sitting static for weeks and weeks, but that's not based on any technical understanding on my end on what the tubes actually experience - cheap insurance.