“Essentially” is the load-bearing weasel word here that allows this story to blame Amazon for their competitors choosing to offer the same goods at higher prices.

You’re listing all of the reasons it’s not a monopoly - you can go almost anywhere else and buy the same good.

Therefore, I think Amazon has a literal monopoly in the tech industry right now, you’re literally forced to buy from them

You literally weren’t and literally aren’t, so they’re literally not.

They have so aggressively and dominantly taken over the supply chain market that no other tech company can currently compete with them in any aspect at all.

If nobody was in competition with them, they’d be raising their prices.