asiteaboutmakingmoney.siterubix.com has the same DA as siterubix.com because the subdomain has the same DA as the root domain.

But that's the only metric that's the same.

Use the Moz open site Explorer comparison tool ( free for a few searches) to compare metrics of Siterubix.com & your subdomain

Google doesn't like to rank subdomains. Think about how many you see in SERPs.

You might see them occasionally, as there is a thing called ' parasite SEO ' where you can use subdomains of big social sites Eg Tumblr, wordpress etc , to take advantage of their DA & also the fact you can throw loads of spammy links at it to get it ranked - but that's not the sort of thing covered by WA.

So, don't bother trying to rank a siterubix site. Switch to your own domain name.