The ideas was to fix both,
1- Google SEO suggestion
2- K2 operations.
Currently I have commented this two lines and K2 features seems to be working well, but wanted to know if there is a possibility
to edit this htaccess code to be compatible with google and k2.

This code will redirect all requests and will create issues.
If you do not have any hardcoded links towards /index.php then you don't really have any issues.