Curious if a diagnosis on a damaged flex plate is correct and cost of repair.

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2006 Suzuki Reno A/T ~ 136k miles, work vehicle does 2-3 hrs of driving every day at low speeds. Car lost power to the tires on freeway after 2 mild stutters, pulled to shoulder and turned car off. Car wouldn't restart , sounded and acted like a bad starter solenoid, whirring starter motor with no engaging of the gears. Replaced starter and transmission range sensor( cause of a lot of shifting problems in renos). Still no engine turn over. Inspected all wiring, finding no electrical problems. All fuses have been checked. With help had someone attempt to start the car while viewing through the flexplate observation port, starter was engaged and rotating flexplate but not turning motor over. Vehicle can easily be moved in drive or reverse ( 0 motor resistance) but park still functions. Battery was disconnected and no codes can be pulled. Motor can be manually turned over at the crankshaft bolt. Has yearly , transmission fluid, radiator and brake fluid flushes. Car history Had a Timing belt, axle , suspension, cylinder head ( Broken idler pulley), transaxle flush April 2014 . Complete coolant system overhaul in December 2013