The website has disallow rules for Yahoo Slurp bot.
https://help.yahoo.com/kb/learn-submit-website-yahoo-robotstxt-directive-sln2213.html
Robots.txt
Get access to data on 19,999,886 websites that are Yahoo Slurp Disallow Customers. We know of 9,901,934 live websites using Yahoo Slurp Disallow and an additional 10,097,952 sites that used Yahoo Slurp Disallow historically and 472,346 websites in the United States.
Get a list of 19,999,886 websites using Yahoo Slurp Disallow which includes location information, hosting data, contact details, 9,901,934 currently live websites and an additional 305,474 domains that redirect to sites in this list. 10,097,952 sites that used this technology previouslyand 472,346 websites in the United States currently using Yahoo Slurp Disallow.
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