Only if you support all of the necessary Vulkan features and extensions. The article states that getting to that point would be a multi-year full time effort, whereas "only" OpenGL seems to be within grasp for this year. And arguably having a lower OpenGL standard soon is better than OpenGL 4.6 in a few years.
Very few applications in the grand scheme of things use Vulkan, and a minority of games do.
Therefore the ROI on supporting OpenGL is very high.