The King lives his life in an unenviable position - he can never please everyone.
In this instance, if he includes his brother and son, both of whom have brought damage and shame on the institution he represents, then he will be accused of hypocrisy, if he doesn't he will be accused of being petty.
I don't think Charles is a petty man.
I do think he is a pragmatist and a realist, and this first Speech is his chance to lay down some clear directional markers for how he sees the monarchy moving forward since is accession.
On that basis, he is showing his previously confirmed intention to slim down the monarchy, and that has to include the exclusion of individuals who are no longer working royals.
The fact that the reasons for his brother and son no longer maintaining their positions are as a result of their behaviours, not his.