Windows 10 update servicing cadence

So take the month of July.  July Windows 10 updates had a release on the B week - second Tuesday, then a fix to a bsod released on the 16th, then even older Windows 10 releases had a release on the D week even though this blog post says older Windows 10 releases will probably get them on the C week.  I'm still confused as to when we should expect updates so that I'm crystal clear as to what is an out of band and what is a C or D release?

Also be aware that until this blog post --to the best of my knowledge - this is the first time it has been acknowledged that these additional C and D releases will be now normal for all Windows 10.  Prior to this, for example 1703 late 2017, we only received one release a month, not two.  If any future changes are made, can this be announced ahead of time not stated after the fact?