Hi, ynot, your theory sounds very correct. That said, Kateeva (and I believe Samsung) are not confirming an explicit commercial relationship at this point. It seems very likely that that Samsung's Gen 6 line for flexible displays will, in fact, use Kateeva's equipment. It is certainly the case that Kateeva is clear on the fact that it's first delivers are focused on customers looking to use thin-film encapsulation and make said displays.
So, let me be clear: I can't confirm or deny because they didn't confirm. But I agree with your conclusions.
There is no difference in HDMI cables. If you can see the picture without visible dropouts or sparklies, the cable is working at 100%. No other cable will display a better version of that picture. You're simply wrong if you think there is a better digital cable than one that is already working.