Deleting code from the repository

Hello

I developed on the fork of the palemoon browser, which is fork of the firefox and under MPL2 license. Beacuse i did not put proper links to the source another developer claim that i delete his code from the repository, as it is about license violation, the second time actually.

I have deleted all code, executables and tags, and uploaded new firefox code not related to that developer.

But he still insists that my repositiry contains his code, he throw me weird links
such this

when open the link there clearly written:
“This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.”

Other forks is not related to me and do not have problems with the license.
Please help me to resolve this problem.
My repository GitHub - Feodor2/Mypal: Web browser

Not allowed here to put another links
The developer who claims is mattatobin
The number of the issue where we are discussing is 237, shuch a mess actually.