I only have personal experience of the rainforest in Malaysia (Sarawak, Sabah and Peninsular Malaya), but that experience was very extensive and included a total of about two years actually living in the jungle and patrolling it. I also had good opportunities to see it from the air. This was genuine rainforest, and only inflammable if it was cut down and dried in the sun, which now and again in small patches, it was. I have no personal experience of Amazonia, but I know that some of it is monsoon forest, which is only wet for a few months of the year. Nevertheless, some of it must be genuine primary rainforest, in which case it will be the same as Malaysian rainforest.
I suspect that some of the fires shown in your diagram are in dry areas which are not proper rainforest, and others are where the forest has been felled and dried out, then set on fire. A lot of them are not even in Brazil. The blank area is probably the real rainforest, which doesn't burn and where there is little human activity. Movement on foot is very difficult in rainforest, and also dangerous, so few people other than the natives who live there wander about in it. So the answer to your question is yes,where it is true primary rainforest,it is resistant to fire.