This claim that pandemics are being made in a lab, was made on an opinion blog, which leads me to believe that it has very low reliability in being a factually sound argument. Investigating further into the types of content that the blog contains, it seems to have a primary focus on other claims supporting a demographic of conspiracy culture, confirmation bias, and fear-mongering. On the margins of the blog page, there are two main quick search categories, "Covid" and "Nazis", along with several independent films one of which is named "When the Terrorists are Supernatural". Additionally, when digging deeper into this claim on other sites, there was a debate about the validity of the claim within articles such as the NBC article; "CIA shifts assessment on Covid origins, saying lab leak likely caused outbreak", although concluding in the article that there was a very "low level of confidence" within the agency's claim. Therefore this leads me to think that it was mainly built on speculation.
politicalfilm.wordpress.com
https://politicalfilm.wordpress.com/2024/07/13/cdc-chief-redfields-testimony/
NBC news article
https://www.nbcnews.com/politics/politics-news/cia-shifts-assessment-covid-origins-saying-lab-leak-likely-caused-outb-rcna189284