The phrase "the point when" is correct and usable in written English.
It is commonly used when referring to a specific moment in time or a certain stage in the progression of an event. For example, "The point when she realized she had been lied to was a turning point in their relationship."
Exact(60)
To the point when it exhausts me".
That was the point when we nicknamed him Little Bastard".
I think that's the point when I hung up".
More to the point: when he's great, so are they.
What is the point when there is no treatment?
But Murray wins the point when Raonic returns long.
"That's the point when we and everyone step out".
I'm at the point when I'm thinking about my anthology".
Straus accepted the point when I asked him about it.
Some drugs are continued for long periods beyond the point when they are needed.
She won the point when a backhand by Zvonareva sailed out.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com