no, it was not, the Olivetti Programma 101 was sold in thousands already in the 60s and was a pretty finite product https://en.wikipedia.org/wiki/History_of_personal_computers#...
It was also mostly complete out of the box, didn't need to be programmed via switches on the front panel, and could be used for actual tasks right away.
Its combination of low cost, high feature count, and out of the box usefulness is why it usually gets referred to as the start of the personal computer industry.
But then I barely would call the Apple-1 that, either. You bought a PCB, optionally pre-assembled that booted into a system monitor. Even though you could directly connect a keyboard and a television (huge improvements; competing products still had toggle switches and indicator lights) that’s not something you could sell to ‘normal’ people.
The Apple II added a power supply, a keyboard (meaning buyers didn’t need to go to some dump to find a keyboard that worked or could be made to work with the system), a case and Basic in ROM. That, for me, made it a personal computer. If you bought it, you could go home, plug it in, and start tinkering.
http://www.trs-80.org/was-the-trs-80-once-the-top-selling-co...
If you think these are synonyms, the TRS-80 may have been more significant, but it wasn’t the first. The race was close, though. Apple II in June, TRS-80 in August, PET in December 1977.
And of course, the ideal first would be the Honeywell Kitchen Computer from 1969, but unfortunately none of them seem to have been sold, if the product even existed for real (https://www.old-computers.com/museum/computer.asp?st=1&c=927). Now, _that_ would be a collectors item.