Based on the linked GAO report, it doesn't even seem like the "little bit" is justified, nevermind the headline that Boeing is in any way meaningfully "ahead". The point of the GAO report is not to assess Boeing's and SpaceX's progress, but to assess NASA's ability to manage the project and its contractors.
From page 10:
> Boeing and SpaceX continue to make progress developing their crew transportation systems, but both contractors have further delayed the certification milestone to early 2019. These changes have occurred as the contractors continue to work to aggressive schedules, and they have had to delay key events regularly. Further delays are likely as the Commercial Crew Program’s schedule risk analysis shows that the certification milestone is likely to further slip.
> In addition, as of mid-June 2018, NASA officials told us that these dates may change soon but that both contractors have not yet provided official updates to their schedules to NASA...While NASA has begun to discuss potential options, it currently does not have a contingency plan for how to ensure an uninterrupted presence on the ISS beyond 2019*
A better headline would be:
NASA can't tell how late Boeing and SpaceX will be with commercial crew