Does this equivalent code make things any clearer for you?
my @temp = @{ $item[3] };
my $key = $item[ 1 ];
my $arrayref = $xyz{ $key }{ is };
push @{ $arrayref }, @temp;
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.