[Video of his comments on around six different occasions have been shown on national TV in the past week . He admitted his action wasn't constitutional]
Yeah... I just did a quick search for "Obama says DACA not constitutional" and came up with nothing.  So I went above typical skepticism, especially after you failed to provide a link.  I found some old videos from 2011 and 2012 being misconstrued.  I suspect you are similarly misconstruing or revising what Obama actually said.  Probably something like "DACA is not a law" because EOs are limited to only affecting the executive branch and do not change or affect laws.  In fact, legislation that EOs conflict with defeat EOs.
Unless you have a link to one of these videos you claim I see little choice but to conclude as such.