i think the Yosemite tie off of the DBY forms would be more locked off... This can still come undone like a regular bowline; is supposed to be backed up.
But really, the pulls should be inline and without deforming the bight that the free end is on. So, we make regular for a regular pull and side ways for a sideways pull to give proper lock and not deform the bight(release side of the release to lock of the half hitch formation)
Another note; a double bowline is more secure, but must be set extra well, especially in stiffer materials. Because as you make the 2 rings that give more security; it also gives a place for the pull to pull higher on; so inadvertently giving more leverage to possibly invert. How that can happen is easiest to see as the reverse of my favorite tying method; the slip knot method of tying a bowline.
MTL-Slip Knot Method of tying DBY
MTL Slip Knot Bowline behind back
i originally saw this method for a single Bowline tie, and called a Climber's Bowline; because if you were trapped on the side of a mountain they would lower a rope from a helicopter or overhead ledge, and you'd make the slipknot with one hand and then lace the line around you with one hand and then set it with one hand. This way you always were still holding on with one hand, and it was okay if you fell at last phase, as long as you held on. Then i adopted it to DBY. It is really an easy way to tie(especially with the 2 rings), but you can also easily see how the reverse could happen and it could invert to a tail inside a slip knot and come undone.
The slip knot method is also good, for tying in a rush; when you can make the slip knot first; and then just finish in a rush when other end is brought to you; or a bundle is drawn tight etc. You can easily even make the slip knot and then hang it on something, even your thumb temporarily, and then finish in an instant when time is right. In tree(or line moving away from you in any other kind of pull), the weight of the Standing Part itself is enough to easily pull the slip knot closed; and it almost works itself to automatically close the finish for you.
Sorry, i jest luv dis'chit!