Welcome to the forum!
iNat doesn’t keep track of GBIF taxon identifiers for the purposes of data export. Instead it sends over the scientific name and GBIF uses its name matching tool.
Some taxa know their GBIF id through a taxon scheme, but this is not available in the API, see here.
Do you mean this?
If so, that is coming directly from Wikipedia, as you can see by the citation at the bottom. You can access that from Wikidata.