here are links to articles claiming the opposite 31st May 2019
all seem to cite the chosun.com article or anonymous sources
http://english.chosun.com/site/data/html_dir/2019/05/31/2019053101126.html
https://www.usatoday.com/story/news/world/2019/05/31/north-korea-executes-senior-officials-over-failed-trump-summit-report/1296383001/
https://www.dailymail.co.uk/news/article-6955395/North-Korea-executes-four-foreign-ministry-officials-Kim-Jong-uns-failed-summit-Trump.html
https://www.nytimes.com/2019/05/30/world/asia/north-korea-envoy-execution.html
https://www.washingtonpost.com/world/2019/05/31/report-north-korean-officials-execution-prompts-skepticism-concern-about-gaps-knowledge