I’m also on the spectrum, and developed a stutter later in life. Have, or were you under a lot of stress when the stutter started? Also should include I’m a cis male with no experience taking testosterone. Adult Onset Stutters are definitely rare, but not unheard of. I’ve also noticed a connection with it for people on the spectrum such as ourselves. I have a theory it’s connected to burnout. I’ve had mine for the last 5ish years. Sometimes it clears up all together, and other times it’s very difficult to hold a conversation. Speech therapy does seem to help, and self care also improves my ability to be fluent. Hope this helps, and you find some answers moving forward.