How are these not a punishment for deviance from the desired positon?
Edit: punish, not publish.
I personally don’t think the “from the river…” slogan should be outlawed, being speech, but it does indeed eliminate the country of Israel by referring to its land as “Palestine”.
The country of Palestine would then stretch from the river (in the West Bank) to the sea (in Gaza).
Of course, it is also sometimes used to call for the dissolution of the state of Israel. Even that is not per se antisemitic (not that I suport this - Israel has won it's right to exist). There are just as many Jewish people living outside of Israel as inside.
Looking at the trends, it's looking extremely bleak for Israel, considering that US support is largely artificial and not organic.
The support arises first and foremost from the work of the israeli lobby AIPAC which takes advantage of America's legalized bribery [1] that results in undue influence on congress.
Another big factor are evangelicals, who are misguided by corrupt pastors and televangelists like John Hagee who are in a business relationship with the israeli lobby and thus have a vested interest in forcing a zionist misinterpretation[4] of the bible to artificially create support for israel. A key factor in the changing landscape of evangelical Christianity is generational differences. Younger evangelicals are often less aligned with traditional evangelical positions and are harder to misguide with misinterpretations that have no sound basis.
[1] So You Want to Bribe a Politician - https://youtu.be/QZcLuT3RasA
[2] Why evangelicals influence US foreign policy in the Middle East - https://www.youtube.com/watch?v=IhT7oyDlBIk
[3] https://en.wikipedia.org/wiki/John_Hagee
[4] Eschatological Madness about Israel, James White - https://www.youtube.com/watch?v=3gmd90XJyhA
Denying someone employment because of their political views is not punishment...
Second of all - if you really believe changing Israel's borders is not an act against Jewish people (and thus antisemitic) you and I cannot agree on anything.
Freedom to agree to disagree....
Many Jewish people around the world and inside Israel in fact are strongly against Israel's actions. Some even participate in BDS or other protest movements, even calling for sanctions of Israel.
Similarly, many people oppose the USA's actions. Some Texans even want to secede, affecting the borders of the USA. That doesn't make them antisemitic (even though the majority of the world's Jewish population outside Israel lives in the USA), nor anti-caucasian, nor anti-black, nor anti-hispanic (though of course some of them could also be some of these things).
There really is no rational reason to say that opposing Israel's actions or wanting it to accommodate certain borders for the Palestinian territories is antisemitic. It is anti-Israel and that's it.
Being of the opinion that the state of Israel is illegitimate or should stop colonialising its neighbours isn't necessarily an antisemitic position, though some antisemites might surely agree. Many others will however stick to the mainstream zionist opinion that jews should be relocated from their home countries to an israeli territory in the Middle East.