Whoever told you that is wrong - this is an English style, traditionally made with the house yeast of an English brewery, which will be fermenting and growing quickly given all the sugar it has to feed on in a high-gravity wort.
It's not dominated by yeast character in the way that a saison is, but nor is yeast character absent as it might be for a Baltic porter,
even the BJCP describe them as "Rich and complex, with variable amounts of roasted grains, maltiness,
fruity esters, hops, and alcohol....Fruity esters may be low to moderately strong".
USians tend to brew them with clean yeast, but that's fine, that's their tradition - it doesn't mean it's right!