Short answer
They're generally low-risk, but feed with care. Erythritol is not toxic like xylitol, but it's a sugar alcohol that can cause diarrhoea and gas in cats. If your cat has a sensitive stomach, it's best to avoid these treats or offer only a tiny piece and watch for any digestive upset.
Erythritol — Food safety facts
Feed with care · Cats · full breakdown on the linked food page
A sugar alcohol that causes diarrhoea and gas. Do not confuse it with xylitol — that one is toxic.
The full verdict, portion guidance and serving notes are collected on the Erythritol food facts page.