Hi,
I don't work for HP.
Not much information available for your product here (Link), look at product information, not much to check, or look here (no MB specs or power supply specs) (Link).
You are correct. A Nvidia 2060 Super reference graphics card requires a 550W PSU. HP modifies components so they work with factory configurations.
Your PC will work with the graphics card HP installs at the factory. You may have power supply issues if you install a retail 2060 Super or better graphics card using the factory configuration.
I can't check your system to look at motherboard (MB) connections, no relevant data available at the above links. Some HP PCs use proprietary power supplies and MBs.
This means I don't know if you can do retail power supply upgrades to run higher powered graphics cards (you may have to purchase a power supply upgrade from HP if you need more power and you have a HP proprietary MB).