To quote one of the links you shared: [Please] Do not condescend me sir.

I don't think you've presented a very compelling case. Of the 5 links: 1 is an NDP petition sign-up page, 1 is a send-a-letter to a political leader, 1 is the NDP tabling a motion in the HoC during which Singh was absent, 1 was a Singh press conference on other topics where he was asked about Palestine and he just admitted that anti-Palestinian racism existed, and 1 was a Singh press conference about other topics back in November where he expressed some focal criticism of the Netanyahu government.

I fail to see much evidence that Singh has a significant role in the NDP's relatively greater criticism of Israel and its ongoing slaughter in Palestine compared to the LPC and CPC. To me, the resources you shared lightly support my sense that Singh is "at arm's length" from his party's politics on that issue.

Whether that's strategic - so that he and the NDP can collectively appeal to as many voters as possible - or whether he personally has been "affected by Israel lobbying"; we'll likely never know