I've got a Pixel 6 Pro on Skinny and no 5G, I reached out to Skinny support on Monday asking to check everything was provisioned \ setup for 5G on my account. Linked them to https://pixel.withgoogle.com/5G/ and a Geekzone thread where 5G hasn't been activated on Skinny accounts in the past, and required reaching out to support. Gave all the details about the June update on Pixels and 5G now working on this phone and Skinny aparently. This was before gajan stated doing the magic. Support told me I "might not be in 5G coverage sometimes" and that I could "buy a new sim and transfer my number if I wanted" instead of any actual understanding or adress of the problem. Still stuck on 4G. I feel like support completly dropped the ball and I ended up ordering a Kogan sim as the Skinny support was just utterly unable to help beyond copy pasting basic FAQs related to 5G.
They literally made me go outside to an area where I had 5g coverage before they did anything, I think its alot less trouble if you live in an area with "5g" coverage. although switching to kogan seems to be the more cost effective, with better coverage solution.
Although they did say my phone was supposed to have 5g support when they asked for my make and model of phone, and never said anything about it being unsuported on their networks which is an interesting thing to note.