Collaborations between Honda, Yamaha, Kawasaki, and Suzuki, as mentioned in the link you provided, indicate that there is interest in exploring the potential of hydrogen engines for motorcycles. These collaborations could involve research and development efforts aimed at creating small hydrogen engines suitable for motorcycles. However, it's important to note that the development and commercialization of new technologies can take time, and there may be several challenges to overcome before hydrogen-powered motorcycles become mainstream.
It would be best to consult recent sources or reach out to the manufacturers directly for the most up-to-date information on the progress of hydrogen-powered motorbikes.