expurgate vs no-platform

expurgate

verb
  • To undertake editing out incorrect, offensive, or otherwise undesirable information from (a book or other publication); to cleanse; to purge. 

  • To edit out (incorrect, offensive, or otherwise undesirable information) from a book or other publication; to cleanse; to purge. 

no-platform

verb
  • To deny (a person or organisation) the use of platforms (newspaper columns, speaking engagements, etc) to publish their opinions, etc. 

How often have the words expurgate and no-platform occurred in a corpus of books? (source: Google Ngram Viewer )