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Because it's obvious they have been written to be parsed by a shell.
OK, no problem, I'll repeat myself in case you missed it in my earlier response to this issue. It's already assumed that a shell is going to be used on the remote side of the connection (as in the OP). There's nothing in the OP that would be interpreted as a shell escape locally; even if there were shell escapes present--passing it to exec in indirect object notation negates the possibility that it gets sent to the shell because each argument is passed as a literal argument to the invocant. Remote shell: yes. Localhost: no. It is the local machine where the shell is to be avoided.
Can you assure that there would be no entries using redirections, pipes, back-quotes, logical operators, variables, wildcards, etc.?
Yes. Actually that is assured. Anything like that is supposed to be wrapped in a shell script and sent+executed on the remote host. Still, this is a moot point because of the specific way I'm calling exec.
A mistake can be valuable or costly, depending on how faithfully you pursue correction
In reply to Re^6: Splitting up quoted/escaped command line arguments