So what? We live in 2022. Time has changed. It's just a diplomatic gesture, a way of showing respect for the independence and sovereignty of your neighbor.
You're reading too much into this. It's not like we're insulting the Ottomans by congratulating the modern-day Bulgarians for their statehood.
This is the worst kind of patriotism. Being confined to the past, unable to open a new chapter.
Be pragmatic and get on with your life.
You dont see them congratulating us in our independance war.