You are correct that the description listed under DYN_CONFIG_EN should have been under DYN_RECONFIG_EPNO.
To make it clear:
DYN_CONFIG_EN: This bit is used to enable the dynamic re-configuration for the selected EP.
If set to 1, indicates the reconfiguration required for selected EP.
DYN_RECCONFIG_EPNO: These bits indicates the EP number for which reconfiguration is required when dyn_config_en
bit is set to 1. Use 0 for EP1, 1 for EP2, etc.