83.169.22.26 is a new datacenter location of deepbit.net but the mined blocks does not appear in the blocklist of the website!
You are telling this like you know for sure :)
1.
As it was said many times, blockchain.info is very inaccurate in terms of detecting the source of blocks.
It would only work if that site is connected to
every mining node in the bitcoin network AND propagation delays are consistent.
2. There is no way to tell what is the IP address of a block's origin. Bitcoin network is p2p and any block can be relayed by most other nodes.
A mining node can be not connected with "wild" nodes at all and only relay blocks via known "friends" or proxies.
Yes, there are better ways to find block origins, but just seeing that some block was received from given IP is certainly not a reason to say that we moved to a new datacenter :)