Question about LP decay and possible MMR decay

Hey there, Ive stopped playing League for some months now but recently Ive been keeping in touch with it because of Worlds as usual. Well, it kinda made me feel like coming back, but I do have a question regarding LP decay and MMR decay (if it does exist). So I was Diamond 3 before I stopped playing if I recall, and now, after checking my OP.GG it seems Ive landed in Gold 1. Well my issue is, I do want to come back, but Im obviously completely rusty and not used to the game so playing against Gold/Plat players at the moment would be perfect. But I dont think that me dropping 2 tiers means that my MMR also decayed which means that I start playing ranked again I will still be matched with Diamond players am I right?
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