Countries cannot vote for themselves, so whatever a broadcaster does in its own country isn't relevant to the votes. (And obviously every country hypes their own candidate as much as possible to their own audience. So does Israel. That's not a problem)
I'd also see it as mostly OK if some country wanted to run a standard promo/advertising campaign for their candidate in other voting countries. A bit desperate, yes, but at least the campaign would be obvious to the public and would essentially just raise interest for the candidate's performance at the contest.
Where I think it gets potentially deceptive is if you call up people to vote who are not even planning to watch the contest, do so with a clear political motivation - and then later pretend all the votes were organic.
(Just checked the group's mails again. Interestingly, their call last year sounded a lot more urgent and openly political. "set an example", "every vote counts", with remarks that you can vote up to 20 times per device. This time the wording was much softer: "we wish her good luck and invite you to vote for her", with no mention of the 20 votes ability. Make of that what you want. Maybe someone complained.)