I agree it seems like a disproportionate act to take given the situation as the author described it, but this certainly does seem like the kind of scenario that involves a lot of context that goes unmentioned.
One explanation for this sequence of events is that the conference planners had since found a new compelling topic reflective of the project's direction to be covered in a keynote speech, in which case the natural topic to replace is one that discusses a "possible"/hypothetical idea. I'm sure there was a better way for leadership to handle this, in particular around communicating their intentions, but this shortcoming seems much more likely a case of incompetence rather than malice towards the speaker, given the lack of information to support the latter.
One explanation for this sequence of events is that the conference planners had since found a new compelling topic reflective of the project's direction to be covered in a keynote speech, in which case the natural topic to replace is one that discusses a "possible"/hypothetical idea. I'm sure there was a better way for leadership to handle this, in particular around communicating their intentions, but this shortcoming seems much more likely a case of incompetence rather than malice towards the speaker, given the lack of information to support the latter.