What an absolutely loathsome post from a clearly bitter hater. Bull HAS won several hundred slams, and perhaps several thousand. Moral historians are still working to uncover the exact number, because some of the earlier ones are the subject of debate. For example, did Bull win Roland Garros 1877? Some say no, because he wasn't yet born and because the tournament wasn't even held, but the braver point out that neither of those things ever stopped at other important events such as Roland Garros 1974 (where he stopped Borg from winning a slam), Wimbledon 1961 (same with Laver), or US Open 1979 (McEnroe was helpless). And don't forget that Bull carried on effortlessly winning CYGSs throughout World War II, as it is clearly cheating to deny him events by not playing them because of a war. It might in fact turn out that Bull's slam count is infinite.
Only someone truly hateful would seek to minimize his accomplishments by saying he could have won 40 slams.