The only razor you need to worry about is Occam's razor.

If you live in the area then you shouldn't need to guess why the upgrade was necessary.

1. Students from Canterbury Village at 73 Hansons jumping the fences and stumbling onto "foreign soil" while drunk

2. Graffiti and vandalism of the fenceline and gate

3. Protesters attacking the static security guards, especially the protesters concerned over the alleged treatment of Uyghurs in Xinjiang

4. Protection of the property and fence-mounted assets such as the new video screens

The explanation is quite some, and should have been even easier to discern for someone living in the area.

I'm quite sure people make a conscious effort to ignore reality because conspiracy is more amusing.