What Is Yellow Signophile in This Map?

This is just Iceland trying to assert that it's part of Europe. Now the British Isles just making Ireland, having Ireland be part of the GMT times and that makes sense to me. But so many of these decisions are just weird political. Imagine if the whole US was one time zone and it was all like Washington time or DC time I should say. Basically the equivalent because China is about depending on who you talk to, it's either bigger or smaller.