The author of the article might have seen problems with swapfiles growing, but he certainly does not have the tools or experience needed to accurately find the cause of those problems. So I wouldn't trust what he says very much.
If you have a situation where it seems like the system is stalling or using too much memory, please do run sysdiagnose (see the man page for the handy key combo) and attach it to a report at bugreport.apple.com.
There is a way to disable sleepimage, but I'd rather not say it, since you should really clean up your disk.