No one who followed him touted him as a running QB, he didn't run much out of high school, he was and is fantastic at buying time in the pocket and the being able to find a receiver downfield or run it.
He was known for being able to throw on the run.
All of that, btw, is shown clearly on his his high school tape. He's not superman, he does have a rare set of gifts. A strong arm is one of those. I've never seen an evaluation that doesn't mention his arm strength.
"Thoughts from Day One: Golson once again showed what he is known for, a very strong arm. He was throwing some lasers to wide receivers and they struggled catching the ball at times. Whether is was a pass out in the flats, a pass 15 yards or a pass 45 yards, it had some zip on it. Many quarterbacks struggled with how the ball came out, but he threw many nice spirals and balls that were catchable."
Scout.com Player Evaluation:
Running Ability / mobility
" Golson had a very strong showing at both the Nike Camp and Elite 11. He won the Quarterback MVP award during the Nike Camp following his solid performance. Golson doesn't have the ideal size for a signal caller, but he certainly makes up for it with his arm strength and accuracy. He has a great release and can make any throw on the field. "
"Golson connected on 207 out of 323 passes at 64-percent as a junior. He had 3,260 passing yards. Two things that stand out to me about Everett's game are, first, his big-time arm," Wilson said. "He can throw the fade, a deep-post, or a deep-out, and also has a good touch on the ball to make the throws underneath. "
"Golson has an extremely strong arm. He puts a lot of velocity on all of his passes and seems to have no limit to his deep ball. Although he can make all the passes, he needs to improve on his touch."
"He's very talented -- strong arm, very accurate. All he had to do was know what he was doing and his keys in terms of his reads. He kind of struggled with that early in the season and obviously, now he's gotten so much better." - Riddick
" If that continues to show itself, he's going to be very, very difficult to defend because he's got that confidence level and a strong arm that he can deliver the ball." - Kelly
He had at least 5 50 yard tosses this year and throws deep cross field balls on the run. Matthew Stafford had the strongest arm of the last few years, compare the two.
I don't know if his arm is "great" but he's got a strong arm by any reasonable standard.