What liquid was he using for the system?
I don't use anything that is conductive as a matter of course but I do just tend to use deionised water and then just different coloured tubing for the effect I'm after. Been water cooling for the last 10 years and a bit and I've never had any leaks with the tubing coming off. I have however had a leak because a slightly loose barb I hadn't tightened and I do remember that pouring water all over the board, GPU, and such, but that just carried on working. I was rather impressed with it to be honest!
I just dried it off the hardware and checked the barbs for being loose and powered it back up, worked fine and carried on for a few years afterward
Well I would suggest something of the following to try. Grab a spare loop if possible and put it together so it could run away from the system with the hardware in it (one way I choose to test for leaks funnily enough!) and see.
Also when putting the tubing on the barb, I have a small cup of hot water to soften the tubing so when it cools down, it seems to clamp harder onto the barb. Been doing it this way for as long as I can remember, I've not had anything popping off the barbs or anything yet and touch wood, I leave these rigs on a lot of the time with our WCG Rosetta and FAH crunching teams
All of my higher end systems are setup with water cooling this way. As long as the barbs are tight (but not overly tight in the block/pump/res etc.) I don't believe there should be a problem.
Have a play around with it, give it a test with an old PSU and any spare parts you might have for another loop and see how you go. Since you could run just the pump/res/rad and block together without it connecting to a system (I guess you'd be able to use the PSU trick so the PSU powers up but doesn't power the system on....) you'll soon see and find out if there's any problems. I stick with 1/2" barbs as they are a better flow rate and it saves having so many different sizes for the barbs, tubes and so on
Judging by the tubing and the barbs, I'd guesstimate that you'd be fine, but again, try before you do anything with hardware inside or connected too it
As I mentioned to
@MxPhenom 216 I only use deionised water so there shouldn't be any issues with conductivity if things do go sideways... Always a personal choice but I've not lost any hardware with it yet
Plus it doesn't stain the tubing which is always handy if you'd like to re-use the tubing