It appears that this was a precast concrete segment bridge erected using a gantry; similar to the picture.
https://www.pci.org/PCI_Docs/Design_Resources/Guides_and_manuals/references/bridge_design_manual/JL-10-Winter_Self-Launching_Erection_Machines_for_Precast_Concrete_Bridges.pdf
Whether the gantry failed or a previously placed unit on which the gantry sat failed first is difficult to identify from the pictures I've seen. Failure of these erector gantries was not uncommon 20 years ago when they were fairly novel.
Quotes you provided are misleading. Did you read the conclusion?:
"We propose that mRNA vaccination is associated with cardiac endothelial inflammation, which may lead to arrhythmia, including AF."