I think you're referring to "Integrity Repipe" videos. He shows red (particularly) and blue pipes in his earlier videos, but later videos show white pipe suffering the same fate. A couple of guys on Terry Love forum have seen and posted pics of white Uponor pipe yellowing, cracking, and leaking after only a few years in service.
What we don't know is why. Most Uponor pipe installed in the last two decades have no issues. Personally, I suspect it's batch issues, and the color pipes do seem to suffer more although they simply may have been selling more colored pipe than white. The reason *my* opinion is batch issues is because when houses are repiped, there are sections of Uponor that are yellowed and cracked, and other sections from the same house (same water quality and pressure) are clean white and undamaged. The other possibility is that some sections of this pipe was exposed to sunlight for a length of time. New construction will often leave plumbing exposed before walls are completed, but this of course won't explain copper to PEX repipes on older homes that suffer Uponor PEX failure after a few years. PEX pipe on an existing home repipe won't see any significant daylight unless the plumber kept exposed rolls in the bed of his pickup...
John