If they can plant explosives they can 100% tap into the circuit or maybe reprogram the board. The CIA is known to be able to do this to specific devices by plucking them from the mail. Mossad could likely do their own production run and ship that to Hezbollah.
Maybe one extra world: They lied maliciously.
Also, they did so repeatedly, over a very long time and while it must have been fully apparent with insider knowledge that this setup cannot work.