If the numinix mod was giving you problems, then I would have recommended contacting numinix, since they're the ones who best understand their modules.

I think csv is the last way I'd dare to do any SQL query preparation, but if it worked for you and you're confident you got all the values into the correct fields, then enjoy.

You could have also just put a new extra_datafiles file with a define for 'SHOW_PRODUCT_INFO_NOTES' to 1 if you don't expect you'll ever turn it off. There are many ways to set those switches. Using the database is only so that you can have an admin screen to change the value. But if it's never going to be changed, then the database is overkill.

I realize it may seem like you're 'out there on your own without support', but I thought you had ongoing dialog about it, so wasn't chiming in so as to not step on anyone else's toes. I can't answer everyone's questions immediately, and when a mod exists to do what's being suggested I find it's usually best to let the mod do its work instead of re-teaching the same thing again. And then there's the flip-side where what's being asked is very specialized and really needs someone to get their hands on the site to do what's needed, and that's a little beyond the scope of these forums, since it's usually better to pay someone with the knowledge to do it right then and there.
Anyway, glad you got it sorted out.