@lproven

The actual text of the article is more accurate:

While the BBC Micro was launched before Arm was formed as a company, the first ARM architecture (the ARM1) was used as the coprocessor in the computers in 1985. The BBC Micro was a huge commercial success with over 1.5 million units sold, helping to influence generations of programmers and engineers, many of whom started coding on this device.

The early ARM chips were attached to the Tube (coprocessor) port on the BBC Micro and that configuration was used for most of the early bringup and software work.

I don't think it's unfair to say that the first computer to have an ARM processor was a BBC Micro.