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This is another fanciful attempt to introduce modern concepts into the past. The senior Druid is depicted as angry at Roman modernisers turning the Stonehenge pillars into classical columns. No real Romans would have done this.
Is this for real? Takeover bids do not seem at all likely. Moreover, Miss Wilson does not seem able to fend them off if they occur. On the other hand, he may just be speaking ironically. I prefer the second possibility but perhaps the cartoonist sees him as a Walter Mitty type.
This looks like a joke among professionals. To us it appears that the man presents no threat at all. The joke is probably to do with the relationship between appearance and reality.