~~I don't know who the player is~~, but the enemy is big because at minute 60, tier 5 neutral items can be found in the jungle. One is Giant's Ring, which increases the hero size and gives you free pathing (you can walk over cliffs etc.). I assume Tiny (appropriately named) has this neutral item.

Edit: Looks like the player is "Respect" from Into the Breach, a pro team and the game was from the TI 2023 regional qualifiers.