Copying, modifying, and posting to the mod portal seems to be in violation of the conditions Earendel licensed his mod to us with. Here are the relevant portions from his license document:
{
Modification
Restricted.
You may make alterations for your own private personal use only.
You are not allowed to distribute anything altered, or derived from this mod with the following exception:
You may post partial modified sections of this mod in Earendel's discord https://discord.gg/ymjUVMv for the purpose of providing bug fixes or enhancements.

Distribution
Yes, but with the following conditions:
The mod must not be modified. (Repackaging the mod does not count as modification. It can be used in mod packs.)
You must disclose the source by providing a link to the mod on the mod portal https://mods.factorio.com, a link to the Earendel's discord https://discord.gg/ymjUVMv for
}
Full text of the license document: https://docs.google.com/document/d/1z-6hZQekEHOu1Pk4z-V5LuwlHnveFLJGTjVAtjYHwMU/edit#heading=h.xoy5dg8b5zwf