It got easier for me once I learned that "shambles" is a noun that is a synonym of "slaughterhouse". Once I learned that, I emphasized shambles slightly differently as I rolled the phrase off my tongue.
Yeah I got that from the link, I had no idea before. However, I feel like if it was "is a shamble" it would make more sense to me than "is a shambles".
"SHA-1 is a slaughterhouse"
"SHA-1 is a shambles"