There not saying not to use other vendors coolants. They are saying not to use anything with Glycol in it. It will not react well with the acrylic.
I thought you knew about that. That was the big debate when it first came out and everyone found out you couldn't use Feser in it.
BoxGods did make mention of switching over to an ABS plastic which may allow the use of Glycol based coolants though.

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