This is not irony. He drops a few Google services and yet other Google services are still in use. The Google cache would still work whether its web site was reporting a 503 or not.
The irony would be that by trying to reduce its reliance on Google he would actually make it more important. That's not the case, even if the 503 was really caused by him not using Google Analytics (I wonder how) or Google CDN.
The 503 is there because currently my blog is hosted on shared hosting plan ... of course CDN is one approach to ensure availability of websites (I've not moved assets to any other CDN yet) but the point is to reduce reliance on Google Services to consider many other alternatives here and there.
The irony would be that by trying to reduce its reliance on Google he would actually make it more important. That's not the case, even if the 503 was really caused by him not using Google Analytics (I wonder how) or Google CDN.