Yes, unfortunately later model year engines use the plastic rocker arm pivots, and NO they are NOT used for assembly purposes only. If you have a broken one, REPLACE IT before you lose your rocker arm.
This tool is used to to compress the valve springs by clamping down on the valve bridges, with the fuel injector removed.
If you do manage to obtain this tool, be very careful not to drop the rocker arm pivot ball during rocker arm removal. Removal by this method ensures that cylinder head to block clamping is not disturbed.
If you don't want to buy the tool, there are several people that have done headstuds successfully one at a time. You could probably get by with removing the head bolt and reinstalling a new one (since they are TTY, you shouldn't re-use them). Or, better, upgrade to studs right now.
I always hate searching for information, finding the thread that has just what I am looking for and then there is no finish, no outcome so to say. With that said, I replaced the broken rocker retainer clip today, with no issues at all, it slipped right in. No really, it did. Popped right over the pedestal and clipped on. Thanks for the heads up about this M-Chan.