Yeah most game news websites don't understand stocks but in this case, DA Vanguard was a massive failure. In the press release, the game was played by 1.5 million people. Not copies sold, just played. This probably includes people that just bought a month of EA Play to check it out.
The newest fifa game (EA sports FC now) also under-performed but they didn't say much about it beyond that. A few more flops and it sounds like EA could be following Ubisoft into crashing hard.