I also replied on your previous post on this. Here it is again.
"It is said to be high in oxalates. So the difference of opinion is based on ones perspective of plants high in oxalates in tortoise diets."
Some say do not feed impatiens (no T) due to the high oxalates, others don't mind feeding it in moderation, while others do not pay any attention to oxalates. Some sources are going to say it is fine, a conservative source like Tortoise Table is going to say it is not safe. Different sources are going to have different opinions and it is all based on oxalates, otherwise the plant is safe.
At the end of the day, a varied diet is important and impatiens are safe. Just high and oxalates and need to keep that in mind.