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In addition to the above, you can request removal from Google's index in Search Console https://support.google.com/webmasters/answer/1663419?hl=en As noted, the removal is temporary (90 days), but if you've removed the pages and any links to them, then they won't reappear. What I would do is just check that your sitemap is up to date, and there aren't any legacy sitemaps hanging about that might still reference the pages, and also run a crawl of your site to ensure that there aren't any remaining links to these pages hanging about.

I have uninstalled the extension and reinstalled it - it's working now. Strange, as it is the same version number. Regardless... happy days!