Every alt I’ve made started in that range even when I was playing diamonds+ in QP. You can check neptuno’s latest smurf where he placed master after going 10-0, his first game was with high golds Twitch
And just like him there are tons of other pros who have streamed placements on lvl 25 accounts and they all started there. This is why with some luck some hardstuck bronze/silvers place their alts much higher than their mains, you just need to go 5-5 to place around plat. They always derank all the way down to their original rank after they’ve played enough tho…