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compile fg.deobf("blank:filename:fileversion") should do what you need. Make sure the libs/ is added as a flatDir repo. The blank is needed, but it is ignored. Filename and fileversion are both taken from the actual name of the file, made by turning the last "-" character into a ":" - this usually means the typical "modid-1.15.2-1.0.jar" file becomes "blank:modid-1.15.2:1.0". This creates a maven coordinate, which ForgeGradle uses to find the file. It will likely not work without this.

You're misunderstanding the system. MCP itself is dead, we took the mappings and tweaked the format to make MCPConfig, which provides Forge's SRG->MCP names. mcpbot's purpose was to allow users to contribute to these MCPConfig mappings. Unfortunately, mcpbot is unmaintained, and with the huge amounts of technical debt acquired, plus the maintainer/creator going dark for a while, we're making a new system to replace it. That's what the Mod Mapping Management System is. It replaces mcpbot, which was designed to allow you to contribute to MCPConfig mappings. The 20200723 release is official. It is recommended. It is not from mcpbot, it was made manually, by a Forge team member. Hopefully this clears up some of your misconceptions of the system

It's probably a misaligned patch in the 1.16.2 update I did yesterday. I'll take a look when it get a chance.

(And I assume that "commonnamespace" is not literally "commonnamespace" but something identifiable to your mod.)