What trevor describes would not normally be called a PLC
"PLC means a small IC whose processing can be changed by flashing it. "
Please stop digging yourself deeper, Trevor. You are likely embarrassing both yourself and the people at Pano, where your article is front page news. Pano, if you are behind this, please find out what PLC really means.
Either way, the widely understood definition of PLC is a programmable logic controller, a smart (not dumb) device typically used for some kind of automation. Look it up. Size from a (big) matchbox to most of a 19" rack, depending on required functionality. Does lots of automation-style IO, which often takes up much more space than the processing.
What I think Trevor's trying to describe is what many people who know the field would recognise as an FPGA (aka Field Programmable Gate Array) chip. They're very clever but rather too complicated for me to define clearly here right now; in some ways they're an alternative to the huge expense of making a dedicated single-purpose logic chip.
If you're making these things in sufficient volume, and the logic programming is fixed for the foreseeable future, you can replace the FPGA with a dedicated custom IC, which will have significant one-time setup costs but may save quite a few dollars per chip in production costs.
Calling whatever's in a Pano a PLC is just silly, when the PLC industry and the FPGA industry both have clear and distinct positions in the technology market.
"a piece of dedicated hardware - absent the need for ram or any form of software - that turns betwork lackets into images on the screen."
Indeed. And keystrokes and mouse movements into something that the hardware and drivers at the far end can recognise. Just like the video shows.