You can mock the grammar of "only colonialism when boats", but AFAIK when the Soviet Union accused some Western power of engaging in colonialism and got "well, you have your Central Asian dependencies" as an answer, they were quick to refine their definition of "colonialism" to include a "transmaritime" checkbox. So, yeah. FWIW there have been those who accused modern nation states of practicing "internal colonialism" in the sense that oftentimes all the money, support and political representation goes overwhelmingly to some select places while the rest of the country is treated as a convenient reservoir of cheap labor.