It isn't possible to suppress the error short of connecting a power adapter with the proper rating, no. These ship with 60W, 65W or 90W adapters.  What is the rating of the original power adapter that came with the system? It is also possible that though the adapter is capable of 100W, the system may not recognize that since it's a non-OEM adapter.  
I have a Latitude 7430 with USB-C thunderbolt ports. I'm receiving a BIOS warning regarding slow charging using passthrough power delivery. Is it possible to suppress this message? More details: I'm using a USB-C hub to reduce the cord clutter when using my laptop in my home/office setup. I have the laptop's original power supply plugged into the Power Delivery (PD) port for the hub and the hub is plugged into the power port for my laptop. I confirmed with the hub's manufacturer that the PD port is rated for up to 100W. The hub's manufacturer suggested I could change BIOS settings to suppress this message. I took a quick look in the BIOS but didn't see anything that may be related to this issue. I checked SupportAssist today and my BIOS is up to date as of last week. Thanks for your help.
BIOS warning using usb-c power delivery with adapter that came with laptop