We spent 2021 on updating our book for the Professional Cloud Architect exam! So many things have changed in those 2 years!
While you wait for the new edition to be published. You can download a free chapter on Anthos here: https://authors.packtpub.com/professional-cloud-architect-certification/
The pre-orders are available on Amazon: https://www.amazon.com/Professional-Cloud-Architect-Google-Certification-ebook/dp/B097HTXKRJ/ref=sr_1_2?qid=1640026489&refinements=p_27%3AKonrad+Clapa&s=books&sr=1-2