Your pretty daft for thinking the 'Notched Pickaxe' has anything to do with Minecraft.
Proof & Point : Oblivion has a Notched Pickaxe too.
This bit of fiction is making the rounds on forums pretty fast - and a quick search through the Elder Scrolls Construction Set will show it to be completely false. You've got a pretty awful standard of proof there.
You do realise that a notched item is one with has a notch in? Notched items have been in TES games for ages...
Really now? I searched the database of items for Daggerfall, Morrowind, and Oblivion. There were not notched pickaxes let alone any other notched items. I did a google search and I did find numerous threads regarding this easteregg where someone has made this claim; this appears to be the only source of information suggesting there was ever a notched pickaxe in previous games, someone persistently posting that such was the case. This does not appear to be true at all though.