They have deprecation policies in at least some cases. They may not be unconditional guarantees but they're still just risk factors to be evaluated individually. I have no problem with the risk averse avoiding any services for their own reasons but it's gone beyond that in many cases here on HN to pure FUD. In any case, you've taken that clause out of context.
In that case, no services that Google offers should be used. They don’t give any guarantees, not even to their paying customers.