Comment on 'Understanding the Frauchiger-Renner argument' by Jeffrey Bub

Bub has recently claimed that the Frauchiger-Renner argument does not require an assumption that the state vector undergoes projection after measurement. It is shown that this claim is not true, and an alternative understanding of the argument is offered.
Comment: 4 pages. Footnote added to make a reference to Bub's paper fit a revised version