For your first claim I think you'll find what von Neumann claimed is a lot more limited than you think, and even then what exactly was interpreted is still up for debate, see from last year:
https://arxiv.org/abs/2105.00242
https://link.springer.com/article/10.1007/s10701-021-00474-5
https://arxiv.org/abs/2105.13996
Likewise, for your second claim I think you'll find von Neumann said that the collapse of the wavefunction can be placed anywhere in a measurement chain, from the first measuring device to the observer's conscious perception of the measurement result. The stronger claims about human consciousness specifically causing the collapse of wave functions come from London and Bauer's book "The Theory of Observation in Quantum Mechanics" and Wigner's "Remarks on the Mind-Body Question". Again, this viewpoint is reflected in the literature too: