I think you’re forgetting about the Delaware reinstatement. They reinstated in both Massachusetts and Delaware in July 2019.
Sure, they’ve made updates at the Massachusetts SOS somewhat consistently over the years except for the 3 year gap between 2016 and 2019. However, they have not done the same with Delaware. The Delaware update is the one that makes you go hmmm? This was their first update at the Delaware SOS since 1999 (20 years).
Why reinstate both at the same time? Why reinstate in Delaware after 20 years of inactivity?
Below is the link to the full reinstatement application for Massachusetts along with screenshots of the confirmation of reinstatement for both Massachusetts and for Delaware...