It's technically true, but it makes it look like CHERI is only for ARM.
I don't see why it implies that. "Arm releases experimental DDR5-enabled $NAME board" wouldn't make it sound like DDR5 is only for Arm, so why would "Arm releases experimental CHERI-enabled Morello board"?
The HN title is an accurate reflection of the article and the event. When the RISC-V group has a similar event, there will be a similar article. Nothing deceptive or incorrect here.