Have you looked at the amendments? They are incredibly minor and don't change the basic operation of the law (i.e. to compel negotiations between Google/Facebook and news publishers). This is 100% face saving for Facebook. I would guess the original calculation re the black out was to gauge impact on other jurisdictions and when they saw/heard resolve tightening in Canada (who has a long history of imposing these sort of 'taxes' on middlemen)/UK/France/etc they blinked.