The author, as has every observer of the situation in modern times, (almost) ignores the true motivations for the change in the Arab stance. The Saudis are doing this because they are threatened- not by Israel but by a long term trend in the region for radicals, militants and religious hotheads (the Arab "street") to seek actual power in the lands where these movements exist. It is a tide that the Saudis to not feel they, as a ruling family, will ultimately be able to survive. So, they walk this high wire act they call diplomacy- offering talk of peace but not having the courage to make public an offer that would actually fly, ie. full withdrawal but no mention of return. Since Nasser, Arab leaders (other than Sadat and Hussein) have only gone as far as immediate political expediency would allow. No different than politics in the USA and Israel, actually, but with more tragic and stupid consequences for the Palestinians, who are left as cannon fodder to their "leaders" cynicism.
from the article: Forty years on the road