Lumps I don't think the METAR and TAF system can deal with decimals.
And the P40 was an allied aircraft as well.
And strangely enough the name rang a "bell"
The company's roots come from a Scottish Engineer called Alexander Bell of telephone fame.
And these days they have ditched aircraft and are in the business of actuators and nuclear components and car parts.
Car parts have been metric for 20 odd years now. And I have only ever seen metric product from them.
It was more than likely a legacy dating back to bell.
Alexander Graham Bell address to Congress
It appears that bell was lobbying for metric in 1906 I wouldn't be surprised if the whole company was being pushed metric anyway.