Sounds like it. None of the brand names you mention were known in my part of the US at the time, and I don't even recognize any of them today except for Gundig.
For TVs, Japan very conveniently for the US shares the same NSTC standard, their only issue is that half of Honshuu, the big island, is on 50 cycle power, the other on 60 cycles (both at 110-120V for consumers like the US with our 60 cycle power). So with their two biggest markets being satisfied with the same gear, I can well imagine the fragmented European market suffering.
Note also SECAM for France, countries it influenced, and apparently Eastern Europe per Wikipedia either initially so its subjects under Soviet domination couldn't receive PAL signals from across the Iron Curtain, or because it's insensitive to amplitude and phase variations from long cable or microwave links.
What about radios? While Sony pioneered the small and inexpensive lo-fi radio with their own transistors, this was very big in the 1950s through the 1960s, but by the time I was paying attention in the 1970s no Japanese company had a commanding lead in radios in the US, they were pretty much a low end commodity by then, except for shortwave sets, which weren't big in the US by then.
The first Walkman was released in Japan in 1979, the brand and general format was very big in the US by the early 1980s: https://en.wikipedia.org/wiki/Walkman
Sony and Phillips also closely collaborated on the Compact Disc, its capacity was supposedly dictated by one Sony guy's insistence that Beethoven's Ninth Symphony as conducted by Herbert von Karajan would fit on one (you have to split a movement between sides for a single vinyl LP release, that was very annoying).
They also scored a big early hit two years later in late 1984 with a very small CD player, the head of the project estimated how small was possible with current technology, made a block of wood that size, and challenged his engineers to make one no bigger. Ah, the "Discman", it was per Wikipedia and my memory very important in the early adoption of CDs: https://en.wikipedia.org/wiki/Discman