Please help me with this I'm having trouble debunking this on my own
After just 11 seconds, the first video says that this object will be visible in May 2011. That statement therefore debunks itself.
I didn't watch the rest of it, but the notes seem to be dredging up the pole shift claims about animals being flash frozen in some sudden catastrophe. However, there is no evidence that these animals weren't frozen in a straightforward way, ie. being trapped and buried in mud or a rockfall and preserved until the area became subject to permafrost very much later. Carbon dating of the remains shows a wide spacing in time of their deaths, thus ruling out any sudden event.
Since there is not the slightest trace of Nibiru anywhere, the believers are bound to keep putting its arrival date back. 2013, 2014, 2015.. This stupidity could go on indefinitely and they will always be able to claim that it's going to appear 'soon'.