About Google recaptcha v3, the article states :

However, as the failure fallback remains the presentation of a traditional CAPTCHA, it remains imperative to do better by users who require alternative CAPTCHA options as also enumerated here.

After reading Googles documentation about recaptcha v3, I think that it is not entirely correct to say 'the failure fallback remains the presentation of a traditional CAPTCHA'.
I understand that recaptcha v3 only sends a score back. It is up to the developer to decide what action to implement in case the score is under a certain threshold. So my impression is that this solution gives the freedom and the responsibility to the developer using this captcha to choose en accessible fallback.