Here are some thoughts: 🏵️🏵️

The arguments are based on the assumption that the spherules are too uniform in size and composition to be natural.
However, there are natural phenomena that can produce objects with these same characteristics. For example, some types of volcanic ash can be very uniform in size and composition.

Also it argues that the spherules are too complex to be of natural origin. However, there is no clear definition of what constitutes "too complex" in this context. It is possible that the spherules are simply the product of a natural process that we do not yet understand.

The spherules have not been definitively linked to any known extraterrestrial objects. However, this does not mean that they are not of extraterrestrial origin. It is possible that the spherules came from an object that has not yet been identified.