Not necessarily.
In fact, there are two instances where military parades could be held before 2029.
The first could be on September 3rd, 2025, which would be the 80th Anniversary of the Chinese People's War of Resistance against Japanese Aggression and the World Anti-Fascist War. In the current backdrop of worsening China-Japan relations and with Japan starting to publicly view China as their #1 enemy, it would be a timely occasion for Beijing to portray the necessary message to Tokyo.
The second could be on August 1st, 2027, which would be the 100th Anniversary of the Founding of the People's Liberation Army. A century has passed since the PLA was founded at Nanchang - I don't think any further explanation is required.