Tyco has a similar item. Last debate here (NJ) was mobile/mod structures. Based on your location, I would suggest that you show the literature from the above link to your area AHJ BEFORE you do it.
My personal opinion....'buried' splices are NG, as Ed said.
BTW, HD probably doesn't stock Molex. As an EC I would replace/rewire/re-feed whatever you are referencing to splice. As an AHJ....buried splices win a red sticker; but a future problem may 'win' you a lot more than that.
