I think the protest crippled reddit considerably. It robbed reddit of a significant number of quality users and moderators, caused an extreme amount of media attention, and created enough of a problem for Google that they had to change course in order to compensate for all the broken links and noticeably poorer search results.
The main reason it looks like it had a much smaller effect is because a lot of missing users have been replaced by bots. And given how hostile those bots are with respect to moderators and the protest, it seems clear that they were put in place by reddit themselves. So don't be fooled by "traffic is normal" announcements and metrics. They mean nothing by themselves.
The protest caused a lot of users to start looking for alternatives and it shed a lot of light on the fediverse, giving it an incredible amount of exposure. People now know that it exists and know that there are alternatives to reddit.
Remember, the worst is yet to come after June 30th when those API changes take effect.