There are many things wrong with their position on this.
1. It is not a prophesy as Paul was not a prophet.
2. A declaration of Peace and Security would only mean something when there has been no peace. But there has been peace for many decades. What significance is this "declaration"?
3. This was referring to Jerusalem's destruction in 70Ce, not our day. There is no Jerusalem under attack today.
For decades Witnesses have been getting excited when the pope or president says "peace and security., it hasn't meant anything.