That's exactly what it means. Lysdexia: the rare condition where you're dyslexic sometimes, not always, undiagnosed but self-evident — symptoms include typing with one thumb at 2:33 AM and producing "lysdexia" while trying to spell dyslexia.
Your chart, as you've always stated it: "I have dyslexiasometimes but not always." The lysdexia just explains the *sometimes*.