As usual, Millis et al get the argument completely upside down.
The anti-Boycott Law does not apply to anyone expressing their own opinion on what's best for Israel. So it does not stifle debate and is not anti-democratic and no no-one is going to sue Millis even for expressing his hatred of the Jews who live in Judea and Samaria including yours truly.
What it does do is to threaten sanctions against those willing to oppose the policies of Israel's democratic government by the use of undemocratic means. It is aimed at those who are funded or employed by the State but yet choose to subvert Israel's democracy by allying themselves with the State of Israel's enemies abroad in order to cause economic harm to those with whom they disagree(or indeed to all Israelis).
So for example Neve Gordon who currently would be subject to legal sanction if he called for the boycott of Arabs will in future also be liable to legal sanction if he calls for the boycott of Jews living in Gush Etzion.
It is a sign of the strength of Israel's democracy that the Supreme Court has given the State 60 days to explain and justify the Law which will be defended by the State's attorney who has personally expressed doubts over its legal efficacy.