Could be 3 scenarios:
The post is not true,either a glitch in USCIS website, user putting their info in VJ or something simillar.
USCIS randomly picks cases to process really fast (highly unlikely)
They have started the actual "risk based approach" but not with the older cases, it's easier to implement the approach with newer cases then to reintroduce older cases to the system. I have seen a few 2022 people getting approved so I think it may make sense. We just have to wait and see if the trend does continue or not.
As a side note obviously having a baby is probably the strongest evidence of a good faith marriage but I don't think it miracalously speeds things up. Any couple with joint financial ties and tax returns also have strong evidence, so we shall wait and see.......