I think they did this comparison right,
A 1SS with the 1LE package cost 36.5k NO other options included
A base GT with the Track package cost 34k NO other options included
A base M3 cost 60k, before add their 'competition package' ( 2.5k )
(the base 1SS is noticeably much better equipped than the Base GT, If you want Brembo's for the GT it's another $1,700)
As for the Boss 302, if I am not mistaken Ford has stopped producing them?

You can no longer 'build' the car on their website, regardless the 1LE ran around VIR in a 2.58.34, the 302 LS ran a 3.02.80
Willow Springs 1LE 1.22.7, 302 LS ran a 1.26.10
Only two tracks I found common times on, and the 302 Boss as stated by somebody else is close to a 50k car? with no back seats, That is Corvette territory....
So in my opinion this comparison was spot on as far as 'fairness'
However to all their own opinion
