That sentence in perlvar does not mean "changing %ENV only changes the environment of all children", it's more like "note that this will change the envirnonment of all your children".
Relax and test it, %ENV represents the current environmental variables of your process, without caveats.
#!/usr/bin/perl
$ENV{FOO} = 1;
print "\$ENV{FOO} is $ENV{FOO} still\n";
exec( '/usr/bin/env' );
The output of env will also mention "FOO" being "1".
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