They didn't say they had 70% of the hashrate, only 70% of coins produced..which sounds a lot like BS since they can't possibly measure that given all the pools involved?
Yes, it is bullshit.
A Bitcoin "miner" do not produce any BTC. Such device only guarantees an increase in the chances to receive the block reward. Pool "mining" allows concentration of the hash rate to distribute the reward in proportional shares. So such claims like this...
Currently almost 70% of all Bitcoins mined today are being created upon KnCMiner hardware, distributed to customers in over 120 countries globally, the companies claimed.
...it is just a plain and straight lie. I do not know what are the underlying reasons to make such claims, but I am sure it will fool potential customers to believe that a Bitcoin "miner" will really create BTC.
By the way, it is impossible to track what Bitcoin "miners" are responsible for the daily supply of BTC. Even if it was possible, a claim like that would not be true anyway. All Bitcoin "mining" devices help to generate the required encryption to form the blockchain. In other words, every block uses the random hash of many devices as possible.