Sorry to say but the aunt patch was in November last year, the Sister patch was in May this year. Now I don't count those minor patches, that to me is 6 months. Now we are in October ANOTHER 6 months. I get it, you love the game, I like it too but, I will not defend them for lack of content.
I would prefer you would stop lying. Patches need alot of work and not counting the in between bugfix patches is downright insulting to the entire dev team which are from time to time present in this forum.
You don't count minor patches cause you don't want to realise that those patches need work as well and so do bugfixes in between each release which would render your 6 months arguments useless instantly.
The benefits of being a mod on picarto for some time now is that you get to know people on discord and on picarto which means i got a little more insight to everything then the rest does. Also i am a patreon for SS so here are the facts.
Nov. 23, 2018 was Aunt 17.0 release.
Nov. 29, 2018 hotfix release.
Dec. 16, 2018 Surprise Christmas release.
Feb 1, 2019 Lot of characters got reworked.
Feb 17, 2019 Site update and new patreon tiers.
May 2, 2019 Sister 18.0 release.
May 4, 2019 Hotfix release.
June 4, 2019 Sister 18.5 release
So regardless how you look at this it never took 6 months for a release. By your logic (where only a full release counts) we get only 2 updates per year which is factually untrue.
And if you would be on discord from time to time you would realise that the people working on this project are not machines either and even with that they provide alot of stuff in between i didnt list because there is no reason to do so.
The numbers don't lie. You either accept the facts or you don't. Everyone can look up the facts for himself.