Yes, the above technique would be a pin in competition judo. A pin in competition judo does not need to be a standard pin; it needs to meet the definition of a pin under the referee rules. This is good especially because judo people can get very nitpicky about what exactly constitutes a particular pin [more on that later]. If your opponent taps at any time and you have not applied an illegal technique, then you win.
The spirit of the judo pin is control of your opponent with at least one of their shoulders on the mat and the ability to disengage and get up at any time.
This is the section of the current (2015) judo referee rules relevant to pins (osaekomi):
ARTICLE 24 - Osaekomi-waza
The Referee shall announce Osaekomi when in his opinion the applied
technique corresponds with the following criteria:
a) The contestant being held must be controlled by his opponent and must have his back, both shoulders and one shoulder in contact with the Tatami.
I think there is an error in the wording here. It should probably be "must have his back, and one or both shoulders". I have never seen a requirement for both shoulders needing to be on the mat, as would be necessary in wrestling.
b) The control can be made from the side, from the rear or from on top.
c) The contestant applying the hold must not have his leg(s) or body controlled by his opponent’s legs.
If you are in someone's guard, it's not a pin. If the opponent captures your leg while you are pinning them in kesa gatame, the pin is broken.
d) At least one contestant must have one part of his body touching the
If you have a single toe in, the pin still counts. This is to avoid competitors trying to escape out of bounds.
e) The contestant applying Osaekomi must have his body in either the Kesa, the Shiho or Ura position, i.e. similar to the techniques Kesa Gatame, Kami-shiho-gatame or Ura-Gatame.
If you finish a far-side cradle (a wrestling move) on your back, even though your opponent may have his shoulders on the mat, this would not be a judo pin.
Also note that the ura-gatame position was recently (c.2013) added to the rules, so nothing is set in stone. It used to be that your hips could not be facing up.
APPENDIX Article 24 - Osaekomi-waza
Should a contestant who is controlling his opponent with an Osaekomi-Waza, changed without losing control, into another Osaekomi-Waza, the Osaekomi time will continue until the announcement of Ippon (or equivalence), Toketa or Mate.
You can switch pins while the pin clock is running, as long as you maintain control. There is no requirement to maintain any single pin position.
And finally to the nitpicking: I think the pictured hold would be classified as a kata gatame (shoulder hold) variation rather than a kesa gatame (scarf hold). The main principle of kesa gatame and its variations (ura kesa gatame, ushiro kesa gatame, kuzure kesa gatame) is the winding of uke's arm. Without the winding, it's closer to a shoulder hold.