Greetings and welcome to BYC
@Kadaily Forget about the "for dummies" article... Only dummies follow that 2' guidance.

For full sized chickens, you are best to use 4 sqft per bird as a
minimum. With bantams you can get away with 3 sqft/bird. When the weather turns bad and your girls can't/won't go outside, they will be stuck inside for a period of time that they are NOT sleeping and will get aggravated much easier and you almost certainly will have issues. Couple that with lost space for food and water containers inside. 2' is not only uncomfortable but unhealthy.
For run space, most folks here recommend 10sqft/bird for LF (large fowl) birds. The attached run there is ~32 sqft so ideally would house 3 birds. Remember you'll lose space for food/water/toys/etc. You can get away with 4 in there with the thought and hope that you'll be letting them out to free range most days. Otherwise, they are going to be "on top" of each other and trapped/locked in a dirt filled prison. Any grass inside will be gone in days, and they'll be scratching/digging out dust bathing areas.
Spend some time here browsing around and you'll "meet" a lot of great folks! There's a wealth of good info here and lots of knowledge and experience shared! Make yourself at home! Oh, and you really should put at least your general location in your profile as it has a huge impact on advice/help asked for or provided. Also, share some pics of you birds and setup as we're all pic addicts!