>Natural gas is neither renewable nor emission-free when burning
Yes you are correct, in fact I actually addressed that in the later part of my comment
>From 2030 onwards the focus will be on decarbonising the remaining ~20% of electricity generation that is gas. How that will be done will depend mostly on how the technology matures in the meantime, but it will likely be replacing natural gas with hydrogen and biogas. Another option could be carbon capture. Or batteries if there is some technological breakthrough and the price of stored energy drops way below it's current 200euro/MWh price.
When picking fruit from a tree, It's usually best to start at the lower branches.