Looking at the tyres of the car in the video they it looks like only the outer rear row has been cut? I could be wrong so sorry if thats the case.
At some astro tracks very worn yellow mini spikes, with 2 rows removed inside and outside front and one row inside and outside rear from the tyres is common. Using new tyres is quite uncommon if you have a look at pictures from stotfold and EPR you will see plenty of very worn looking tyres on the cars. I have also used 2wd front tyres mounted on 4wd rims on the front of my 4wd before.
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