The numbers they provide in the notes are damage per shot, not damage per second (dps) as shown in the game, and are listed without boosts from buildings, library or leo research. I don't know exactly what the firing rate of a HT is, and it also depends on library research I think? But it is longer than a second, so the damage per shot will be higher than the damage per second you see in game.
It is silly that they listed the numbers in the notes that way, given what we can see in game. But that is the source of a number of discrepancies. I can confirm that my tanks dps listed in game doubled after the update.