"Universally accepted historical conclusion"

This does not mean literally every historian agrees.

It means the proposition is so widely accepted that disagreement is marginal.

For example:

• The French Revolution occurred in 1789.
• The Thirteenth Amendment abolished slavery in law.
• Industrialization greatly expanded factory production.

These are treated as established historical conclusions.

By contrast:

• Why the Industrial Revolution began in Britain first.
• Whether legal equality primarily reflected moral ideals or capitalist interests.

These remain contested.

So there is no contradiction between saying there is a broad scholarly consensus and avoiding the phrase universal truth. Consensus describes the current state of scholarship; "universal truth" suggests an absolute certainty that historical interpretation rarely claims.