Too right!
In fact, there would have been no malt recognizable as "modern" malts back then. No black malt (wasn't "invented" until 1817). No "brown malt" as we know it; there may have been something called "brown malt" but it was the base malt, i.e. diastatic. Any attempt to make anything as dark as modern-day brown malt would spontaneously combust!
The clever guys could make paler "amber malts", even "pale malt" (if they had the time, but the most popular beer was Porter, so why bother?). Even as long ago as 1650 they were making "light" coloured malt in Derby using coke (from sea coal). Early in the 18th C. nearby Burton (with their new canal) took over and started exporting "Burton Ale", one of the
lightest coloured ales available. They were making Ale then, though it was probably being hopped by then like the increasingly popular "beer".
That Terry Foster recipe looks like it was taken from a historic recipe as it has a common 1:1:1 malt mix (late 18th, very early 19th C.?). But they weren't modern malts, or anything like modern malts.