Groundbreaking in any shape or form is usually enough for tabloids to assume construction, but often it does not occur right away. This is variable and depends on the project and also who you may ask. For some caissons is a sign of construction, but for others, it may simply be shoring or excavation.
Dargy has raised a lot of money for this, and its essentially financed in the tune of 200 million plus. Just because they focus on low-rises and mid rises doesn't mean that they can't build skyscrapers.
Many developers have portfolios where the structures in the 2-5 story range greatly outnumber highrises and skyscrapers. So you need to check the facts son before you make silly statements.