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 20,683,291 websites that are Yahoo Slurp Disallow Customers. We know of 10,485,295 live websites using Yahoo Slurp Disallow and an additional 10,197,996 sites that used Yahoo Slurp Disallow historically and 488,562 websites in the United States.
Get a list of 20,683,291 websites using Yahoo Slurp Disallow which includes location information, hosting data, contact details, 10,485,295 currently live websites and an additional 285,259 domains that redirect to sites in this list. 10,197,996 sites that used this technology previouslyand 488,562 websites in the United States currently using Yahoo Slurp Disallow.
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