How accurate is mmr check op.gg?

Heej I just wonder, im gold V in promos to gold 4. I want to check my mmr for fun and it says welcome to elo hell 1,244 that looks like an mmr of an silver 3 o.o but I have an winstreak of 4 games and I played only with gold 4- plat 5 in ranked. So is it really working or not? I just wanted to know :3
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