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 18,731,777 websites that are Yahoo Slurp Disallow Customers. We know of 7,796,360 live websites using Yahoo Slurp Disallow and an additional 10,935,417 sites that used Yahoo Slurp Disallow historically and 371,089 websites in the United States.
Get a list of 18,731,777 websites using Yahoo Slurp Disallow which includes location information, hosting data, contact details, 7,796,360 currently live websites and an additional 173,357 domains that redirect to sites in this list. 10,935,417 sites that used this technology previously and 371,089 websites in the United States currently using Yahoo Slurp Disallow.
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