No one probably cares anymore but I'm fairly certain there's an error on the first page of the review.
The PCI-e 1x slots are 2.0, not 3.0. I've read it on the tech specs section of the Asus website. I've read it in my manual. And I'm seeing it right now in AIDA64 that my PCI-e 1x networking card is @ 1x 2.0.
FWIW, I have a Ryzen 5 3600 in my Asus STRIX B450-F Gaming II board.
AIDA64 shows both my Asus PCE-AC56 Dual-Band 2x2 AC1300 WiFi PCIe adapter and the onboard Intel I211 Gigabit Ethernet running at PCI-e 2.0 x1.
Are either one of these limited in bandwidth by PCI-e 2.0 x1? Nah, not even close to 500MB/s.
However, if someone was planning on using a PCI-e 3.0 x1 S-ATA III controller card, one single SSD would fully saturate that bandwidth transferring a file.
Also, I'm 99% sure the bottom PCI-e x16 slot (which is PCI-e x4 as you can see on the back of the motherboard) is also 2.0, not 3.0.
TL;DR
The board has 2x PCI-e x16 length 3.0 slots, 1x PCI-e x16 length 2.0 slot, and 3x PCI-e 1x 2.0 slots.
First PCI-e x16 is x16. Second PCI-e x16 is x8 max. Third PCI-e x16 (the 2.0 one) is x4 max.
I think it was this site that I submitted a correction for the Pentium G4560 a long time ago. It listed that it supported the AVX instruction set. It doesn't. I don't see it listed on the review page anymore.
However, that could have been another site. I can't remember. There was a (practically) "see an error?" link on the page that I was able to click and report.
I get it. 99.999% of people will never see it, again. It's just for those that will.
I love this site.. it's my go to for looking at pictures of the PCB's for GPU's and motherboards.
Wait a second... the TL;DR was longer than the original lol. My bad.
Here's what AIDA64 shows for me (pic of PCI-e x1 slots on B450 chipset and another pic just showing it is this B450-F Gaming II board):
Notice the last pic showing the PCI-e x16 slot with my RX480 8GB showing that it is at 2.0...
What is going on lol? Have I misunderstood the tech specs in the manual AND AIDA64 is showing me incorrect info? I even restarted AIDA64 with GPU-z's graphics load running just to make sure the AIDA64 software wasn't seeing something wrong. GPU-z certainly shows my RX480 in a PCI-e 3.0 x16 slot.
What have I done here? Cause more confusion? I'm... I'm just going to leave, now.