That's right. In the monthly DC comic Legion of Super Heroes #74 (Oct. 1995), Superboy let us know that with the casual mention above. The tunnel you see the characters traveling through above is the newest visual interpretation of time travel at DC Comics (circa 1995). It's quite obvious to one time readers that the time travel look was loosely based on the interdimensional tunnel from Sliders (which Superboy notes)...and the look of time travel in DC Comics remains this way even in today's time. A definite "inside" homage to Sliders.
This was a very good compliment to Sliders' first season from the Legion writers at the time...because there was no advertising money given and no reason for them to mention the series. None except for the fact that they liked it and were/are fans like us.
Superboy and The Legion of Super Heroes are trademarks of DC Comics 1998.