Sure, and hence the company won. The point here is that language can have
very specific meaning. There is a difference between 'should' and 'shall', even though most people would think they're
effectively the same. If I said "You should complete that task" to one of my team I'm not really giving them the choice and leaving it up to them. I'm telling them to do something. Outside of RFCs and contracts language is a bit ambiguous and lawyers use that to their advantage.
In exactly the same way, there is also a difference between 'is' and 'was', and I think it's totally plausible that a Google lawyer might use that to hide the fact they used GMail data to train AI in the past.
That doesn't mean they did. It only means I wouldn't be surprised if someone proves they did, and that their lawyer used the tense of a response to try to hide it.