What is "prolier-than-though"?

what does "prolier-than-though" mean? I had googled, but only "prolier-than-thou" came up. No explanation found, however. See the source below: "Half a century later, Sir Alex Ferguson remains Old Labour in speech, if not always in deed, and talks with sincere warmth and lack of... show more what does "prolier-than-though" mean? I had googled, but only "prolier-than-thou" came up. No explanation found, however.

See the source below:

"Half a century later, Sir Alex Ferguson remains Old Labour in speech, if not always in deed, and talks with sincere warmth and lack of prolier-than-though piety (his family were blessed, he points out, with an inside toilet) about his upbringing."
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