The base doesn't absorb wax. The wax just sticks to the base in the microscopic crevices in the base.
You're melting a hot liquid onto the base. Think about melting butter in a pot and then pouring that onto a cold piece of bread or a warm piece of bread - any difference? I'm sure the cold bread will lower the temp of the melted butter a little, but not enough for a noticeable difference. With a board, maybe a cold base will lower the temp of the melted wax a touch, but then you run an iron over top which will warm everything up .
I watched the video and read through other forums discussing it but I just don't see the difference to a regular iron. In reviews they say it's more efficient at melting the wax - that only means it's more efficient at heating a spot since it doesn't heat the air around it like a hair dryer or heats by conduction like an iron. So what does that mean in real life? They're all very vague about it. You might get to a certain temp quicker with an ir waxer than an iron, or it uses less electricity? What are we talking about here? Save a second or two, save 10 cents?
It doesn't mean you have less chance of burning the base than with an iron, since they warn in the video to keep it moving otherwise the wax will burn.
Uses less wax? Well, they're just rubbing the wax on and melting that, which you can do with an iron.
In Japan, the IR waxer Wax Future by Montana is popular in some shops. They say the same stuff, "penetrates really deep", "same as hotboxing for 10 hours" etc. Yet there is no proof that it's better, and people who have done it say there's no noticeable difference.
One thing I think I picked up in the other forums was that the IR waxed boards hold wax for less days than an ironed board. I may be remembering that wrong as by that point I had concluded I didn't want a waxer.
Believe me, when I saw Powhound had bought one I was super interested, but I can't find anything online that conclusively shows that it's better.
Also, feel free to argue any of the points I've made. I'm always happy to learn, and if I'm proven wrong then so be it, I'll be the wiser for it.