Examples of things that would qualify:

• Postponing the election by three months or more (past the full 4-year term)

• Banning one or more (nontrivial) parties from running (e.g. banning one of the main Arab parties)

• Introducing significant barriers to voting (e.g. removing voting booths from most Arab towns or making election day not be a holiday)

This isn't a universal description, but that's the minimum level of severity for this to settle as yes. Will answer whether any other hypotheticals raised in the comments count. I will not be betting in this market.