This was already discussed under:
How should we handle answers with partial scientific speculation and/or partial answers which are not from Hindu perspective?
And the consensus was to either add a citation-needed banner or delete the scientific statements from such answers.
But I am asking whether I have liberty to add a proved scientific statement...
The problem with adding concluding remarks like this is, it will lead to unnecessary discussion under such answers on whether what you claim as "a proven scientific fact" is really proven or not. How do you plan to defend these statements? E.g., check the comments under this answer.
In another answer, a user claimed that brahmins are genetically different from others as they are born with a special nāḍī (nerve). The user added this in support of birth-based varṇa system. When questioned about the source in comments, the answer was updated not with a link to a scientific paper but with a link to a video of an ācārya. Now how is one supposed to validate this scientific claim of the ācārya?
Usefulness of such approach:
It will obviously increase the authenticity of the scriptural
statements because of advancement of scientific approach in our times.
To keep it even, are you also willing to add a disclaimer when other science-related statements you are quoting from scripture have no really scientific backing?
You can avoid running into such issues by not making any kind of scientific statements in your answers. And just leaving users to draw their own conclusions.