I believe an exemption was put in place for this.
“Due to the severe circumstances related to the pandemic, some of the designated hospitals have stopped conducting health examination in compliance with the measures taken. The Ministry of Labor had announced officially that at the moment cram schools applying for language teachers’ work permit are not required to provide the health check, with an aim to reduce cross-cities movement in order to acquire health check.”
Note: it’s best checking if this is still valid due to no end date specified for the exemption.