Doesn't need to be related to left-handed past. Just imagine those lanes were the other way around, then if you and me were going on Valhallavägen opposite directions and wanted to U turn over there at the same time then we can easily be in the way of each other.
When you have two multi lane one way roads going opposite ways and want add a two-way connection between them then you often want to put lanes the opposite of normal way. Another example is all roads connecting Chiang Mai's old city outer and inner circle road. The country is left-handed but those connecting roads are right handed, the opposite of Stockholm intersection
I haven't seen any historical maps of the road so I no longer have any reason to believe it stems from that. I was just going based on that (flawed) logic.
When you have two multi lane one way roads going opposite ways and want add a two-way connection between them then you often want to put lanes the opposite of normal way. Another example is all roads connecting Chiang Mai's old city outer and inner circle road. The country is left-handed but those connecting roads are right handed, the opposite of Stockholm intersection