It will be fine.
I’ve launched off Etive falls in ancient boats like Dancer, MI335(!) and Magic Bat. All fine.
I’ve paddled all sorts where, just like modern bikes, apparently you needed flat Hull, creek boat or sharp edges.
Would you take a rigid 1990’s Kona for a spin down trails? You’re not going to be fastest or comfiest out there. But you’ll be out there.
I’ve also repaired a Big Dog picked up from the local tip for free, with a 30cm split in the hull. Fixed with our kitchen mini blow torch and an old spoon. That too fell off triple falls, shortly after my 1983 Dagger Prophet OC1 which had faded from red to nearly white (aka ‘The Cock’). The plastic will be fine.