Lol. If Israel could manipulate HN do you think so many anti-Israel posts would appear on the front page, and each mitigating or nuanced comment about Israel would be flagged so quickly? No, Israel does not control or manipulate HN.
There may well be a pro-Israel brigade going out of their way to move that along, but there is an equally rapid anti-Israel brigade. Nothing remains on the front page for long.
Posts that veer into overt anti-Semitic conspiracy theory get flagged because the mask slips too far and they reveal the game.
So, no. Israel is not "winning the up- and downvote war" of HN.