my opinion is taht it is not a desirable route to synthsize your targeted molecules. so you can see https://en.wikipedia.org/wiki/Aflatoxin_total_synthesis
I don't see this as helpful. Any synthesis can be done many different ways. If this is about learning, then the published route is simply different.
This is how I see this problem, especially as a learning exercise. I often started out my synthesis planning with trying to learn about what chemistry is known and what reactions work well. In this case, I might have started with
phloroglucinol. Introducing a single substituent would still give a symmetrical molecule. A second substituent would make it unsymmetrical. If you were to make the lactone, this would leave the two OH groups open. If doing real chemistry, one could just try the next ring closure. This could go 50:50, preferably the desired or the undesired. If it gave the undesired, then you could try a selective protection reaction. Again, the two OH groups are different, so it wouldn't be unreasonable to expect that one might react faster than the other. If not, then one could start with a protected form of the phloroglucinol and step your way through it.
I guessing the literature may already provide some answers to the chemistry I am speculating about. I also appreciate how your proposed route can be like routes I may have proposed until I developed more skill or knowledge as to what may actually work. I believe the reality is natural product synthesis is strewn with failed routes. That is the price of learning.