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@Dammit
Here is a quote from the article (all I can locate online at the moment):
"The 318i block we used to use was absolutely standard up to 1100bhp. But if we took the wastegate off, that was really hanging the engine out. If it made a lap, it made 1300 horsepower.
But we often broke an engine in half lengthways."
-Article on Paul Rosche's turbocharged BMW F1 engine
The reinforcement was needed to stop the block splitting.
You are correct in that they used teh 100,000 km engines as development and early test units, but as the quote says, they didn't last and the casting had to be changed.