The STM32L4Q5 is not supported in v1.7.0 of stlink. When trying to use st-flash with this chip, st-flash reports:
WARN: Common.c: unknown chip id! 0x471
Failed to connect to target.

• Programmer/board type: [STLINK/V3] (e.g STLINK /V1, /V2, /V2-onboard, /V2-clone, /V3)
• Operating system an version: [Linux] (e.g Linux, macOS, Windows)
• stlink tools version and/or git commit hash: [v1.7.0] (e.g v1.6.1/git-d0416149)
• stlink commandline tool name: [st-flash] (e.g st-info, st-flash, st-trace, st-util)
• Target chip (and board, if applicable): [STM32L4Q5 custom board] (e.g STM32F103C8T6 (NUCLEO-F103RB))