The odd thing is for me I have all the updates - Chromecast - no longer has the option for third part Screensaver and the the most up to date Aleria Views app but when the SS kicks in Aleria Views still works. Looks like maybe I just can't reset this device... or uninstall the app.
It looks like OP posted an AMP link. These should load faster, but AMP is controversial because of concerns over privacy and the Open Web .
Maybe check out the canonical page instead: https://www.reviewgeek.com/125089/chromecast-with-google-tv-loses-third-party-screensavers/
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