This announcement was made very shortly after Trump started making claims that a vaccine could be ready "late October/early November". Trump is a known fool, and even were he not, his losing prospects at re-election, combined with the criticism of his administration's response to the pandemic make it seem like he could be pushing vaccine makers to rush a treatment to pump up voter support.

I believe vaccine makers are diplomatically responding to the Trump headline by saying "We aren't going to rush this for the wrong reasons."