I think it is okay (perhaps ideal) for the delegate to weigh any given instance of WA campaigning on a few factors - who sent the TG, what their motive was, and so on - and make a decision about whether to invoke the Accord based on them. For example, for me personally, a TG campaign attempting to mislead people about a resolution would make me strongly inclined to vote the other way; a campaign by natives for or against a liberation resolution would make me inclined to vote in their favor or not change my opinion; an attempt by a resolution's opposition to sabotage them by sending spam in favor of the resolution would incline me in favor, and so on.
The overall goal of the Accord is to reduce spam, and what counts as spam is necessarily a bit of a judgement call. Blind application to all cases is as bad as never using it at all.