A blocked oil pickup resulting in enough lack of oil so that the engine oil light comes on, compounded by idiot drivers who do not shut down the engine when the oil light comes on is how excess RTV would damage an engine.
Some types of RTV are not healthy for catalatic converters. But verry little gets into the oil, and then it has to get into the cylinder and into the exhaust. And even then little of what makes it into the exhaust gets into contact with the inside of the catalatic converter.
And it has to be the wrong kind of RTV in the first place for it to have any posability of causing any problem with the catalatic converter.
The excess RTV very likely caused absolutely on additional reduction in the life of your engine and catalatic converter.
Some types of RTV are not healthy for catalatic converters. But verry little gets into the oil, and then it has to get into the cylinder and into the exhaust. And even then little of what makes it into the exhaust gets into contact with the inside of the catalatic converter.
And it has to be the wrong kind of RTV in the first place for it to have any posability of causing any problem with the catalatic converter.
The excess RTV very likely caused absolutely on additional reduction in the life of your engine and catalatic converter.