It was just a nightmare he was having during the 10 days before the Cell Games. All Just a Dream: The ending of Cell's What If? story in 1.3 doesn't bother with the bulky Super Saiyan Grade 2 and 3 sub-transformations note AKA "Ultra Super Saiyan", "Ascended Super Saiyan", "Power-Weighted", and many other names used by Vegeta and Future Trunks to fight Semi-Perfect Cell in their place Trunks is given Super Saiyan 2, a form he wouldn't achieve until he returned in Dragon Ball Super.
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