Helldivers 2 dev warns players not to 'fall in love' with datamined content that might never come out: 'Some are ancient leftovers, some are things that will pop up in the game'
The bots only just officially got Factory Striders. They were seen before on high difficulty missions but only rarely. Now there are mid level difficulty missions to down them.
So far, Arrowhead has been nothing short of impressive with what they've put out. I think it's time to trust the devs and wait.