I can only try;
So that provision wasn’t added.
Now, what can anyone do if the other Arab states attack Israel and Egypt in violation, joins them anyway?
If Israel had not signed that treaty, the Egyptian economy probably would have collapsed from trying to build up, to keep fighting Israel, and Israel would have had far more land by keeping the Sinai (on maps I have seen it looks to me like at least twice, Israels entire present, land mass).
This was why Sadat said “I feel sorry for Begin, we got all this land back, and all he got was a piece of paper”.