Maybe it is a matter of interpreting whether or not access to becoming the new jobs is, like the old jobs, considered a 'job quest'. The article states that, "All of the job quests related to the new jobs will be in Ishgard as well, so the condition to access those will be the same". Now, it could be that the quests to progress the jobs and skills and such are gated behind the main story, but perhaps initially getting the job may be different than what it was in 2.0? Maybe they are changing something with job acquisition with these new jobs that don't have base classes that makes them attainable somehow without a job quest? That's the only way I could interpret what was said and somehow see the new jobs available to everyone without doing the main story.
*This reminds me of how so many people wanted NIN locked behind the main story and Yugiri plotline - we know how that ended up*
