I personally believe that while @_ should certainly not be used as a general purpose variable, @array is as a horrible a name as one can be. It's like having a dog and calling it "dog!!" FWIW, a single letter variable would be better, especially here, since it's used only in two lines - except that I would use two scalars instead. Even better: since the whole file is slurped anyway, how 'bout the following?

my %data = map { chomp; split /\t/, $_, 2 } <FH>;
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(Of course, it will fail if there are not enough entries for some record. In which case it would require some sanitizing which is left as an exercise to the OP.)