Dosen't this public display of the same idea by a different author before the presentation date of this publication constitutes nulifies this patent and makes it public domain?
A patent doesn't become spontaneously invalid by someone posting undiscovered killer prior art. Until they go to court with someone for infringement or a third party pays the fees for an interpartes review by the USPTO, the status of the patent doesn't change. In practice, if the patentee knew about this they would probably decide it was not reasonable to threaten anyone.
It is also possible that the legs we can't see in the photo are distinctive and very different in looks from the patented table. In that case it might not be "killer" prior art.
It could be prior art if published before the filing date unless derived from the inventor. See the Core77 web page showing the date 25 May 2012. The design patent USD697343 has a priority date of Jun 23, 2012.
See MPEP 2128 II ELECTRONIC PUBLICATIONS AS PRIOR ART, 35 U.S. Code § 102 - Conditions for patentability; novelty, 35 U.S. Code § 172 - Right of priority, 35 U.S. Code § 119 - Benefit of earlier filing date; right of priority (There are no earlier foreign patent applications cited) and 35 U.S. Code § 171 - Patents for designs, wherein novelty is binding on design patents.
It has the appearance of prior art subject to a finding by a court of law or Patent Office action. (See 35 U.S. Code § 282 - Presumption of validity; defenses).
While the law is meant to be readable and understandable by the public if you have an interest in this matter you'd be better served seeking legal advice from a patent attorney rather than asking for an unqualified response here. It's meaning is also subject to case law.