Even wikipedia points out that the "human wave attack" thing is a US invention and born out of racist confusion upon seeing short attack tactics

A typical Chinese short attack was carried out at night by numerous fireteams on a narrow front against the weakest point in enemy defenses.[29] The PVA assault team would crawl undetected within grenade range, then launch surprise attacks against the defenders in order to breach the defenses by relying on maximum shock and confusion.[29] If the initial shock failed to breach the defenses, additional fireteams would press on behind them and attack the same point until a breach was created.[29] Once penetration was achieved, the bulk of the Chinese forces would move into the enemy rear and attack from behind.[31] During the attacks, the Chinese assault teams would disperse while masking themselves using the terrain, and this made it difficult for UN defenders to target numerous Chinese troops.[32] Attacks by the successive Chinese fireteams were also carefully timed to minimize casualties.[33] Due to primitive communication systems and tight political controls within the Chinese army, short attacks were often repeated indefinitely until either the defenses were penetrated or the attacker's ammunition supply were exhausted, regardless of the chances of success or the human cost

So yeah radios made these go on too long, but the whole thing was an actual tactic and hardly waves being thrown

In response to the media's stereotype of Chinese assault troops deployed in vast "human seas", a joke circulated among the US servicemen was "How many hordes are there in a Chinese platoon?"