I would try opening the IAM file first that this part resides in, then open this part from within the IAM and try deleting the items.
This still won't correct the poor modeling techniques found in the IPT file. The un-constrained sketch's I suspect is the major issue with this model. Since the base feature can move around within the environment due to it's sketch being un-constrained. Any sketches and features created after this feature can move off the base feature/solid and create downstream problems.
Since it looks like a standard HSS shape, I would have started with a CC item placed in the model. Since the CC item is modeled about the Origin Axis's and it's primary sketch, fully constrained, it will reduce the need for a number of work planes.
I suspect that as JD stated, it would be far faster to create this part from scratch. There is nothing wrong with editing parts within the context of a IAM file and using Adaptivity, as long as one uses solid modeling techniques.
Inventor 2020, In-Cad, Simulation Mechanical
Just insert the picture rather than attaching it as a file
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