They are substituting word processors for typewriters.
FYI: this sentence pair and many other ones are originally sourced from Tanaka Corpus (田中コーパス) and migrated to Tatoeba Corpus. Tanaka Corpus was compiled by Professor Tanaka in 2001. So, I believe this sentence was written right after the release of Windows 95.
I don’t think “typewriter” in English or タイプライター in Japanese should be listed on Most Common 4,000. It’s become a less frequent word.