I think it's pretty derogatory to the rest of the Essex side, implying that they are a 1-player set-up. They've been the strongest 1st class county for the past 40 years, judging by the number of County Championships they have won (8, all since 1979), and in a lot of that time their best player(s) have been on contract to England*, so never turned out for the county.
But, as you say, both teams played to the same rules. It was a shame that the entire match was played in winter conditions.
*Looking through the records, I was surprised that John Lever was never the leading first class wicket taker in an English season. I particularly remember his feats in 1979, when he took 56 first class wickets in June alone, and Essex won the championship at a canter, but Derek Underwood was the leading wicket taker over the entire season with 104. Lever spent a good deal of that summer as 12th Man for England, so missed a few first class matches.