No, that’s not how it works at all:
“Article 19 of the WHO Constitution gives the World Health Assembly the authority to adopt conventions or agreements on matters of health. A two-third majority is needed to adopt such conventions or agreements.”
There’s no “automatic replacement of a nation’s constitution” by the World Health Organization.
“The INB (intergovernmental negotiating body) held its first meeting on February 24, 2022. The second meeting, where the members are expected to discuss the progress on a working draft, is scheduled to be held by August 1, 2022. A progress report is expected to be delivered to the 76 th World Health Assembly in 2023, and its outcome will be submitted to the 77 th World Health Assembly in 2024 for consideration. Intermittent public hearings are also planned.
In December 2021, the World Health Assembly adopted a decision titled “The World Together” at its second special session since it was founded in 1948.
Under the decision, the health organisation established an intergovernmental negotiating body (INB) to draft and negotiate the contents of the pandemic treaty in compliance with Article 19 of the WHO Constitution.
The pandemic treaty is expected to cover aspects like data sharing and genome sequencing of emerging viruses and equitable distribution of vaccines and drugs and related research throughout the world.
Most countries have followed the “me-first” approach which is not an effective way to deal with a global pandemic, WHO Director-General Dr. Tedros Adhanom Ghebreyesus said in a statement.”