Is there any change in the rate limit for historical data API?

I've seen a couple of posts on this forum mentioning that the rate limit for historical data API is 3 requests/second. But when I try running more than 3 requests parallelly it isn't giving any error.

Here's the sample code to get an idea of what I'm doing

async.parallel(
[
function (callback) {
kc.getHistoricalData(
"2863105",
"minute",
"2021-02-04T13:58:09.283Z",
"2021-02-14T13:58:09.284Z",
false
).then((res) => callback(null, res));
},
...repeat more then 3 times
],
function (err, results) {
if (err) console.error(err);
else console.log(results);
}
);

Any idea why this is executing successfully without any error?