"Since getting rid of tipping on April 1"
Ooh, that's a really long period of time, so the results certainly must be valid. This increase couldn't be due to any other factor, could it? Assuming, of course, the story itself is true because, quite honestly, a 300% increase in profits means an even bigger increase in gross revenues. It also means a big increase in wait-staff, cooks, etc.
I smell quite the lie.