The technology of modern reactors ,like the one in the article, is a greater advancement from early reactors that the 1900th century electric car to a modern one.
The materials, manufacturing techniques, fuels, controls, and components are only achievable due to modern advancements.
The latest reactors will be cheaper, more efficient, and safer. They are a necessary stopgap to overcome the transient nature of renewable energy in the UK and an important piece in ensuring energy availability and detachment from from fossil fuels.
And electric cars have had over 100 years, so should we have given up on them? Your argument is flawed.