That looks like a UK helmet cover loosely stretched over a US style mich helmet, and a generic M4 rather than an L119a1. And scrim scarves haven't been worn by anyone in the forces under the age of 50 for about 20 years. Definitely an airsoft image!
Shame that most of you won’t be able to see the full RUSI content (which the article references), some extracts will get uploaded on YouTube, the more interesting points happen with live mics during breaks …..
To be fair, this stuff is everywhere. Remember the White House Department for Agriculture listed Wakanda as a trade partner nation..which was only put on the list as a test to see if the staff were checking stuff..