As far as I know, DS-5 is the only IDE officially supported for the VYBRID_SAMPLE_CODE_SBCH.
However, for MQX, all those IDEs (IDE, IAR, Kiel and DS) are still supported
Generally noticed that the lists are shorter than when I previously saw that page.
If you want specifics, then I noticed that under IDE's IAR, Kiel, and even ARM's DS-5 are no longer listed on the page. Similar for other sections such as Emulators/Probes.
As far as I know, DS-5 is the only IDE officially supported for the VYBRID_SAMPLE_CODE_SBCH.
However, for MQX, all those IDEs (IDE, IAR, Kiel and DS) are still supported