Here is a map which shows how the land was divided among the tribes of Israel:
Now considering that the lost tribes have not been regathered; on what grounds does this commentator's opinion hold water?
Here's a map approximating the land grant from HaShem to Avraham and his children (through Yitschaq specifically, according to B`resheet 21:12), based on B`resheet 15:18-21 and 12:7:
Contrary to the speaker's pro-"palestinian" bent, based on Torah the people of Eretz Yisra`el are showing considerable restraint, because they could fight for more if they wanted to. What he calls "theft" in error is plain-to-see as considerable restraint. Zionist leader Chaim Weizmann even was willing to compromise on a division of the land (then held by the British, including what is currently the state of Yisra`el, the peninsula of Sinai and the kingdom of Jordan, even if the partition for Jews "were the size of a tablecloth". I would recommend
this video to those who want to examine the history of the decisions, negotiations and conflict involving the territory.
There is something, however, to be said for those who refuse their birthright. One need only look at the example of Esav, who gave up his birthright for a bowl of stew. When it came to the time of blessing, Esav could not recover the blessing due his birthright, despite his pleading, and had to rely on a lesser blessing (which could be called a mercy). What the speaker seems to be doing is like what would have happened if Esav had hung around Ya`akov after losing the blessing of the firstborn and
nagged him every day about it, as if he held some higher moral ground.
That being said, those Jews who have returned to Eretz Yisra`el may not all be religious or of righteous or worthy, but at least they took hold of their birthright, given all the forces that worked to open that up to them. I submit that while HaShem used the heathen nations to scatter them, He is also able to use heathen nations in their prophesied re-gathering. Does the speaker and his fellows suggest that HaShem cannot do as he pleases? Do they fall into the same error of those who opposed the N`vi`im, who saw the providence of HaShem amidst the warnings and said "We are well enough without"? The questions beg asking ... and answering.