Yeah, thats about it :)

FWIW, you don't need the extra {} in this case , but its the simplest rule to remember

$ perl -MData::Dump -e " $f = { 1..8 }; delete @$f{1..4}; dd$f; "
{ 5 => 6, 7 => 8 }
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Also happens to be first rule in References quick reference

99/100 I use rule 1 :)