[MrVitaliy]

The title is misleading. They just extracted character frequencies from source files which fail to capture 'Delete', 'Shift', 'Ctrl', 'Alt', etc keys.

Even has Paul Graham name at the end, as if 'Look, this is totally legit!'

[bostonpete]

Well, Ctrl and Alt aren't related to the programming language (more the editor or OS) and neither is Delete.

Shift is, but that could have (should have IMO) been extracted from the character frequencies in the source files...