It implied that the election will somehow delay the decision to proceed, it won't. As I've said earlier it's much better to have this out of the way prior to any planning application.
It's not the decision to proceed, it's that the government cannot get involved in this project until the election is over. It can't offer PR assistance, it can't offer departmental assistance behind what's already been agreed (if anything) and it can't be public about it.
It's possible that the project team need some advice, or assurances, before the final plan is put to the Universal board and it won't be able to get those until the election over. This may delay internal decisions somewhat, it may not, we don't actually know either way. It could be, as you've suggested, a blessing in disguise to get it over and done with sooner rather than later.
There are many internal government projects, which were due to be heard by funding / finance panels in the next few weeks, which have now been delayed until after the summer. This is because the government also can't commit to any new spending during the Purdah period. This would include transport, power, general infrastructure stuff, which may indirectly impact the Universal project.
The project is in early stages and a government shut down might not actually have any impact at all, but it also could. It's entirely speculation at this point, much like everything else.
I was merely clarifying that cross party support on a project does not mean that Purdah rules won't apply still for the government. Individual parties can announce whatever they want, the government can't for the moment.