You can't just make sweeping statements like,
I have heard of Cirrus's with severely damaged engines due to lean operation.
How do you know it wasn't a manufacturing quality control issue?
What damage have they suffered?
In who's opinion is it damage caused by 'leaning'?
What leaning practice was he using 'to save money on fuel bill'?
With respect your post makes no more sense than the post that started this thread.