Tweeting “her” months later doesn’t prove anything. That Tweet might superficially look like evidence of intent, but if you think about it, it’s not.
Based on the date (right after the public release of the assistant), it is actually very strong evidence for "we thought it would be awesome to have an AI voice companion that sounds like the one in Her", which, combined with the (undisputed) revelation that they indeed tried (twice) to get the person who did that voice, is a very strong indicator of the intent of the thing that happened many months before.