The updates were never given timetables.
The following order of next updates has not changed since the inclusion of the tech update by the vote of the patreons three years ago and before the inclusion - the order of the three character updates were the same as they are now.
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As for the tech update, yes, we've gone over time and again that 3 years ago DC was underinformed, made a terrible estimate, and shot himself in the foot and has since been poor managed. We all agree on that. However, no matter how poorly it's been handled - he hasn't promised anything in the past 2 years of when that tech update would be released nor the character updates. Just simply the order of the expected future updates.
There was no promise of any "update months ago."
Your claim of "promised update" holds no water, but is simply you being disgruntled that that progress isn't going the pace you personally wish. There is no problem being disappointed, a lot of us are. However, don't make up things which don't exist to give false credence to your accusations.
And again, update releases - whether the release themselves or the timetable of releases - are not tier benefits for subscriber patreons. You're repeating a claim that is already known as not true. Your claim of "stringing along" also holds no water.