Can anyone share some insight on SimpleSneakyExceptionMystery?

Your code is not readable.
You will never pass code review on production

• read the instructions very thoroughly
• perhaps use console to know what your input is
• carefully compare your output to the expected values

That code throws an error:

=
^

SyntaxError: Unexpected token '='

Any help on #1?

No need, I got it my own :)

Any help on #2?

OP solved it, closing

The Kata is not stright forward, can anyone help me to understand this?

Read the description again, you're not asked to check if the input is a palindrome number.

I don't fully understand the question here. How come 1251 can be a palindrome number?

split does not modify original string

same here..

Very clever !!