Didn't they hold back sales of these for a while due to issues? perhaps they changed the design slightly given that video is dated August seems reasonable.
That's a possibility, although given that the foam is the biggest differentiator between the regular Embody and the Logitech version (cosmetic differences aside), it's a little surprising.
In any case, I've also sent HM an email to ask about it.
Update: Got the following response from HM:
We can confirm the correct foam has been fitted, due regulations in the UK surrounding flammability, we use two different types of the copper cooling foam for chairs in the UK and for the EU.
The UK foam will appear different as we had to use a slightly different alternative to meet regulations but it is still copper-infused as advertised.
So nothing to worry about.
Update 2: Interestingly, it looks like the foam actually extends around 2 inches further towards the front of the seat on the UK version compared to the US version.
A common complaint from US owners was that some people could feel the cutoff of the foam on their thighs. No such problem with mine.