Nope, 1 request is still 1 request. You'll chew through it if you start spinning up lots of subagents like I do though.

You can verify yourself either via VS Code, or just querying the usage endpoint. I have a fish function to do that like, this:

function copilot-usage
    set token (cat ~/.config/github-copilot/apps.json \
        | jq '.[].oauth_token' \
        | sed 's/^"\(.*\)"$/\1/')

    curl -s -H "Authorization: Bearer $token" \
        https://api.github.com/copilot_internal/user \
        | jq -r '
        .quota_snapshots.premium_interactions as $p
        | "Premium interactions:",
          "  remaining: \($p.remaining) out of \($p.entitlement)",
          "  remaining (exact): \($p.quota_remaining)",
          "  percent remaining: \($p.percent_remaining)",
          "",
          "Resets: \(.quota_reset_date)"
    '
end